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Vitamin A Supplements

Vitamin A Supplements (Including Cod Liver Oil) Reviewed by ConsumerLab.com

Learn what to look for when choosing the best vitamin A supplement, including beta-carotene and cod liver oil. Review test results and quality and cost comparisons for popular brands. Plus, dosage, safety, side effects, drug interactions and more. Understand what you are taking before you buy.

Vitamin A Supplements Review

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Product Review

Multivitamin and Multimineral Supplements Review

Best Multivitamins In 2023 -- Caution with Gummies

CL Answer

Why is beta-carotene still an ingredient in some supplements? Isn't it dangerous?

Beta-carotene can be found in supplements. Get clinical evidence from studies on beta-carotene's impact on mortality, smoking, and vision.

Elderly Woman Reading Supplement Bottle

Product Review

Vision Supplements Review (with Lutein, Zeaxanthin & AREDS2 Formulas)

Find the Best Vision Supplement Based Our Tests

Product Review

Fruits, Veggies, and Other Greens Supplements Review (Including Spirulina and Chlorella)

Avoid Lead in Greens, Problems with Pills, and Don't Give Up Eating Whole Foods.

Greens Review Oct 2023

CL Answer

Are antioxidant supplements good or bad for you?

Learn more about whether antioxidants like astaxanthin, beta-carotene, coenzyme Q10, curcumin, resveratrol, selenium, vitamin A, vitamin C and vitamin E are safe and if they help prevent chronic diseases.

Can Antioxidants Cause You to Die Sooner? -- antioxidant supplements and carrots

CL Answer

I am very concerned about getting too much vitamin A. Is there danger in getting too much vitamin A if I take fish oil, which I've heard contains a lot of vitamin A, in addition to my multivitamin?

Find out if taking vitamin A along with fish oil can lead to an excess of vitamin A and how to avoid vitamin A overdose.

Fish Oil Supplements Poured from Bottle into Hand

Product Review

Astaxanthin Supplements Review

See Which Astaxanthin Products Passed or Failed CL's Tests

Astaxanthin supplements reviewed by ConsumerLab.com

CL Answer

Which vitamins and minerals should be taken together or separately?

Find out the best way to take vitamins and minerals and which vitamins and minerals should be taken together or separately for proper absorption. ConsumerLab answer explains the best way to take vitamins and minerals.

Vitamins & Minerals That Should Be Taken Together or Separately -- various vitamins in spoons

CL Answer

Do any supplements or foods help prevent sunburn or skin damage from sun exposure? Can any increase your risk of sun-related skin damage?

Find out which supplements may help protect from sunburn and sun-related skin damage, including beta-carotene, vitamins A and C, and cocoa.

Dermatologist examining the skin on the back of an older woman for signs of sun damage or skin cancer

News Release

October 06, 2022

Lion’s Mane and Chaga Supplement Labels May Mislead, According to ConsumerLab Tests

  White Plains, New York, October 6, 2022 — Lion’s mane and chaga supplements are often promoted to improve memory and mood, boost the immune system, and a range of other health benefits.

News Release

February 23, 2021

ConsumerLab Tests Reveal Best Prostate Supplements With Saw Palmetto and Beta-Sitosterol

White Plains, New York, February 23, 2021 — Over half of men over age 60 may experience increased urinary frequency, difficulty urinating, or other symptoms of an enlarged prostate, also known as benign prostate hyperplasia, or BPH.

Product Review

Lycopene Supplements Review

Find the Best Lycopene Supplements. CL Tests Reveal That Not All Lycopene Supplements Contain What They Claim.

Lycopene Supplements Reviewed by ConsumerLab.com

CL Answer

Risks of Too Many Vitamins & Supplements

Taking too many vitamin supplements -- or taking too much of a particular supplement -- can have short and long-term adverse effects.

Too Many Vitamins

CL Answer

Is it true that some vitamins or supplements can cause cancer?

Learn more about the effects of certain vitamins and supplements on cancer, including beta-carotene, vitamins E and B9, and multivitamins.

Woman holding vitamins in hand

CL Answer

What is fermented cod liver oil, such as Blue Ice? Is it better than regular cod liver oil?

Fermented cod liver oil information including if Rosita & Blue Ice (Green Pastures) is as good a source of vitamins and DHA as regular.

Fermented Oil On Spoon and in Syringe

Product Review

Zinc Supplements and Lozenges Review

Find the Best Zinc Supplements and Lozenges. Have a Cold? See CL's Top Picks Among Zinc Supplements and Lozenges.

Zinc Supplements and Lozenges Reviewed by ConsumerLab.com

Product Review

Rhodiola Rosea Supplements Review

Do Rhodiola Supplements Help With Depression and Anxiety? Find Out and See Which Rhodiola Supplements Provide the Best Quality & Value.

Rhodiola Supplements Reviewed by ConsumerLab.com

News Release

August 22, 2019

Best Reishi Mushroom Supplements Identified by ConsumerLab

White Plains, New York, August 22, 2019 — Reishi mushroom supplements are promoted for many uses, from strengthening the immune system and lowering blood sugar, to improving cardiovascular health and reducing cancerous tumors.

CL Answer

I read that sterol supplements to lower cholesterol like CholestOff can block the absorption of vitamins. Is that true?

Find out if CholestOff and other sterol supplements can block vitamin absorption in the body and other safety concerns.

Elderly Man Reading Supplement Bottle

News Release

October 26, 2018

Best Vitamin A Supplements, Including Cod Liver Oils, Identified by ConsumerLab

White Plains, New York, October 26, 2018 — Vitamin A is necessary to maintain good vision, skin, and immune functioning, and supplementation can be beneficial for certain conditions — although most people get enough from food and getting too much vitamin A can be dangerous.

Product Review

Cranberry Juices and Supplements Review

CL's Tests Show Which Cranberry Juices and Supplements Are Best and Cost the Least

Product Review

Protein Powders, Shakes, and Meal Replacements Review

Find Out Which Protein Products Passed or Failed Our Tests

Clinical Update

8/25/2013

Antioxidants: Too Much of a Good Thing?

A new, long-term study of Americans found the risk of dying over the course of the study (about 14 years) was lowest when antioxidant levels in the blood were above the lowest levels (the bottom 20% of the population). However, for people in the top 20% of blood levels for vitamins A and E, the risk of death increased compared to people with moderate levels. For selenium and beta-carotene, there was no significant difference in the death rate between moderate and high levels, although for vitamin C some additional benefit was seen at high, but not the highest, levels.
 
The results suggest that antioxidant supplements may be useful for those who are nutritionally deficient, but, as noted by the researchers, "beyond a certain threshold, higher levels do not lead to additional benefit, and may potentially be toxic." More details (including specific serum levels) are found in the linked updates to the following reviews, which include our test results and quality ratings of products:
 
 
  
  

Clinical Update

11/17/2013

Latest Supplement Recommendations

New draft recommendations on vitamin and mineral supplement use were published this week by the U.S. Preventive Services Task Force. The recommendations apply only to healthy adults without nutritional deficiencies. They focus only on the use of supplements for the prevention of cardiovascular disease and cancer at doses not exceeding tolerable upper intake levels. The recommendations are based on existing science and are generally consistent with information already presented in ConsumerLab.com's Product Reviews.  We have summarized the recommendations below, with links to more information in ConsumerLab.com's reports:


- Beta-Carotene and Vitamin E:  Supplementation with either does not provide a benefit. Vitamin E does not pose a risk of harm, but beta-carotene increases the risk of lung cancer in people at risk for lung cancer.

- Other Single Vitamins, Minerals, Pairs, and Multivitamins: There is inadequate evidence regarding a benefit or a risk of harm.

The task force stressed that at excessive doses (above tolerable upper intake levels) there is evidence of harm with supplementation, such as with vitamin A and vitamin D

CL Answer

Which "whole food" multivitamins don't include synthetic vitamins? How about Complete Foods, Sunwarrior, Garden of Life, Nature's Brands, and Doctors' Research?

Find out which "whole food" multivitamins are only from foods and which include synthetic vitamins, including Complete Foods Nutrition-OctoMega MultiVitamin; Sunwarrior; Garden of Life-MyKind Organics; Nature's Brands-PhytoVitamins; Doctors' Research MultiVitamin.

Fresh Broccoli and Lemon Beside Multivitamins

News Release

September 19, 2015

ConsumerLab.com Tests Popular Prostate Supplements with Saw Palmetto and Beta-Sitosterol

White Plains, New York, September 19, 2015 — Can prostate supplements with ingredients such as saw palmetto or beta-sitosterol improve symptoms of an enlarged prostate, a condition affecting more than half of men over age 60? And, if so, which supplements are properly made and labeled and ...

CL Answer

Do any supplements reduce the side effects of chemotherapy? Should any be avoided?

Find out if there are any supplements that can help with the side effects of chemotherapy, such as nausea, vomiting, diarrhea, nerve damage and others. ConsumerLab.com's answer explains.

Supplements & Chemotherapy Side Effects -- chemotherapy medicine and capsules

News Release

January 20, 2015

ConsumerLab.com Identifies Best Vitamin A Supplements, But Cautions That Most People Don't Need Them

White Plains, New York, January 20, 2015 — Vitamin A supplements can save your sight and reduce your risk of infection if you are vitamin A deficient. However, deficiency is rare in the U.S., where people are more likely to be at risk for excess vitamin A.

CL Answer

Is it better to get vitamins from foods or supplements, and are natural vitamins better than synthetic vitamins?

Learn more about the benefits of getting vitamins from food versus supplements, natural versus synthetic vitamins, and more.

Getting Vitamins and Minerals from Food vs. Supplements -- fruits, vegetables, and a spoon containing supplements on a table

Product Review

Ginseng Supplements Review

Find the Best Ginseng Supplement. Key "Ginsenosides" Found to Range 10-Fold Across Products.

Ginseng Supplements Reviewed by ConsumerLab

Product Review

Menopause Supplements Review (Soy and Red Clover Isoflavones, Black Cohosh) and Progesterone Creams

Choose the Best Menopause Supplement. Find Out Now Which Soy Isoflavone, Red Clover, Black Cohosh, and Progesterone Products Have the Active Compounds You Want!

Menopause Supplements Tested by ConsumerLab.com -- Soy and Red Clover Isoflavones, Black Cohosh, and Progesterone Cream

Product Review

Ginger Supplements, Chews & Spices Review

Tests Reveal Best and Worst Ginger Supplements & Spices. Poor Quality and Lead Contamination Discovered in Some Products.

Ginger Supplements Reviewed By Consumerlab.com

Product Review

Echinacea Supplements Review

Many Echinacea Supplements Fail CL's Tests. Make Sure You Know What You're Getting!

Echinacea supplements reviewed by ConsumerLab.com

Product Review

Cholesterol-Lowering Supplements Review (Sterols/Stanols and Policosanol)

Find the Best Cholesterol-Lowering Supplement. See Which Plant Sterol and Policosanol Supplements Passed Our Tests and Are Our Top Picks.

Sterol, Stanol, and Policosanol Supplements for Cholesterol-lowering Reviewed by ConsumerLab.com

Product Review

Fish Oil, Krill Oil, and Algal Oil Omega-3 (DHA & EPA) Supplements Review

See Our Omega-3 Top Picks and Avoid Rancid Fish Oils.

Fish Oil and Other Marine Oil Supplements Reviewed by ConsumerLab.com

Product Review

Nutrition Bars & Cookies Review (For Energy, Fiber, Protein, Meal Replacement, and Whole Foods)

Find the Best Nutrition Bar or Cookie. ConsumerLab Tests Reveals Not All Nutrition Bars and Cookies Contain What They Claim.

Nutrition Bars Reviewed by ConsumerLab.com (Energy, Fiber, Meal Replacement, Protein, and Whole Food Bars)

Product Review

Iron Supplements Review (Iron Pills, Liquids and Chews)

See Which Iron Supplements Are CL's Top Picks for Different Needs

Clinical Update

1/27/2019

Caution With Antioxidants

A new study suggests it might be risky to take antioxidant supplements during cancer treatment. We have added this important information to our answer to the following question: Can supplements with antioxidants like beta-carotene and vitamins A and E cause you to die sooner?

Clinical Update

1/15/2019

Don't Take Minerals With Certain Supplements

Taking minerals like calcium and magnesium can dramatically reduce the absorption of carotenoids like lycopene, beta carotene, and astaxanthin. Get the details in the Concerns and Cautions section of the Lycopene Supplements Review.

Clinical Update

3/18/2012

Lower Melanoma Risk with Vitamin A

A study of people ages 50 to 76 found the risk of developing melanoma (over an average of 6 years) was 40% lower among those who took a vitamin A supplement than among those who did not. The protective effect appeared strongest and most statistically significant among women, and only occurred with vitamin A from retinol and, not beta-carotene. For details, including the dose (which matters), see the updated information in the Vitamin A Supplement ReviewMore >>

CL Answer

Why does my multivitamin make me nauseous? Is there anything that can help?

Find out if ingredients in multivitamins can cause nausea and gastrointestinal discomfort.

Multivitamins Causing Nausea -- woman with nausea holding multivitamin

CL Answer

I'm at risk for both macular degeneration and Alzheimer's disease. I've read that more EPA than DHA is good for macular degeneration, but the reverse is true for Alzheimer's. What do you recommend?

Find out if taking fish oil supplements or eating fish can help for macular degeneration and Alzheimer's disease. ConsumerLab.com's answer explains.

Fish Oil Capsules and Salmon on White Table

Product Review

African Mango (Seed Extract) Supplements for Weight Loss Review Article

Do African Mango Supplements Really Work For Weight Loss? Learn More About Choosing the Best African Mango Supplement: Evidence, Safety, Side Effects & More.

African Mango Seed Extract

Product Review

Prostate Supplements Review (Saw Palmetto and Beta-Sitosterol)

Find the Best Prostate Supplement for Symptoms of BPH. See Which Prostate Supplement Passed or Failed CL's Tests of Quality.

CL Answer

Do hair loss supplements, such as Viviscal, Hair La Vie, and Nutrafol, or topical essential oils work?

Vitamins and supplements that may help with hair loss and thinning, including saw palmetto, beta-sitosterol, protein, iron, and vitamin D.

Supplements for Hair Loss -- woman looking at hairbrush

CL Answer

The maker of my multivitamin says it doesn't include folic acid because too much from supplements can be harmful. Is that true?

Learn more about the harmful effects from too much folic acid, including increased risk of prostate cancer and kidney damage.

Harm from Too Much Folic Acid ? -- Multivitamin bottle and label

CL Answer

Do vitamin C supplements help prevent cataracts?

Learn more about the link between vitamin C and cataracts, based on clinical evidence.

Does Vitamin C Prevent Cataracts? -- bottle of vitamin C

CL Answer

Which supplements reduce hearing loss?

Can supplements such as alpha-lipoic acid, magnesium, N-acetyl-cysteine, folate or vitamins B-12, C and/or E help prevent or improve symptoms among people with hearing loss due to excessive noise or aging? Find out what the clinical evidence shows, and learn whether Advanced Hearing Formula, a supplement marketed for ear health, is likely to help.

Older man holding his hand up to his ear due to hearing loss

CL Answer

What are "broad-spectrum micronutrient" supplements, and do they have greater health benefits than multivitamin/multimineral supplements?

Learn about "broad-spectrum micronutrients" and how they compare to multivitamin/multimineral supplements.

Multivitamins on a table with a multivitamin supplement nutrition label in front of the multivitamins

CL Answer

Do any supplements help with pancreatitis? Do any cause pancreatitis?

Find out if supplements including digestive enzymes, antioxidants, or medium-chain triglycerides are beneficial for chronic pancreatitis, and learn which supplements might worsen symptoms.

Person with pancreatitis holding their abdomen

Product Review

Reishi Mushroom Supplements Review

Find the Best Reishi Mushroom Supplement. See How Reishi Supplements Differ.

Reishi Mushrooms tested by ConsumerLab.com

CL Answer

Is Super Beta Prostate better than other prostate supplements?

Find out if Super Beta Prostate is effective, including clinical evidence and price.

Is Super Beta Prostate better than other prostate supplements? -- a bottle of Super Beta Prostate pills

Product Review

Lion's Mane and Chaga Supplements Review

Read Labels Carefully -- Many Can Mislead

Lion's Mane and Chaga Supplements tested by ConsumerLab.com

CL Answer

Are there vitamins or supplements that can reduce my risk of breast cancer? Do any increase cancer risk?

Find out if certain vitamins, supplements and foods such as fish oil, olive oil, vitamin C and others, can help reduce the risk of breast cancer. ConsumerLab.com's answer explains.

Supplements & Breast Cancer Risk -- doctor holding pink breast cancer awareness ribbon

CL Answer

Is it true that there is no point in taking fish oil supplements for heart health?

Taking fish oil for heart health may be a benefit. Learn more about omega fatty acids from fish oil and it's impacts.ains.

Fish Oil for Heart Health? -- fish oil capsules and stethoscope

Product Review

PQQ (Pyrroloquinoline Quinone) Supplements Review

Learn What PQQ Does and Which PQQ Supplements are Best

CL Answer

Are there supplements that can reduce prostate size?

How to reduce prostate size using supplements for benign prostatic hyperplasia (BPH), including beta-sitosterol and saw palmetto.

Sign Saying BPH with Tablets on Blue Background

CL Answer

What are the health benefits of nutritional yeast and is it safe?

Learn about the nutritional content and health benefits of nutritional yeast (nooch), evidence for or against nutritional yeast for boosting the immune system, lowering cholesterol and blood sugar, plus safety and side effects of nutritional yeast.

Nutritional Yeast

CL Answer

I use beta-sitosterol for my prostate. Should it be taken with or without food?

How should you take the prostate supplement beta-sitosterol to maximize absorption? Learn more at ConsumerLab.com.

How to Take Beta-Sitosterol -- man holding beta-sitosterol capsules

CL Answer

Are L-carnosine supplements helpful and safe?

Learn about the potential health benefits of L-carnosine, as well as possible safety concerns, drug interactions and cost.

Capsules with white powder and spoon holding white powder on white background

CL Answer

What is desiccated beef liver? What is it used for, and is it safe?

Description of desiccated beef liver, including what it is used for, its nutrient content, and safety concerns.

Beef liver powder

Product Review

Saffron Supplements Review

See How Saffron Supplements Compare and What They Do

Product Review

Avocado Oil Review

Find the Best Avocado Oil for Purity, Freshness and Taste. Some Others May Include Rotten Avocado or Other Oils.

Avocado oil reviewed by ConsumerLab.com

Product Review

Ginkgo (Ginkgo Biloba) Supplements Review

Choose the Best Ginkgo Biloba Supplement. Finding Real Ginkgo Isn't Easy — 60% Fail ConsumerLab's Tests of Quality.

Ginkgo Biloba Supplements Tested by ConsumerLab.com

CL Answer

I'm interested in using Himalayan salt. What are the health benefits with it and other specialty salts? Are there contaminants in these salts?

Himalayan salt health benefits, along with other gourmet salts like Hawaiian and Mediterranean. Info including what's in them and their safety.

Himalayan Salt -- spoonful of pink Himalayan salt

Product Review

Ashwagandha Supplements Review

Find the Best Ashwagandha Supplement. Only 56% of Ashwagandha Products Pass Tests.

Ashwagandha supplements reviewed by ConsumerLab.com

Product Review

Choline and Lecithin Supplements Review (Including Phosphatidylcholine, CDP-Choline, and Alpha-GPC)

Product Review

Electrolytes & Sports Drinks Review

See Which Sports Drinks, Powders, and Pills Deliver the Right Electrolytes

Product Review

Lavender and Tea Tree Essential Oils Review

Oils Tested for Authenticity and Purity

Product Review

Olive Leaf Extract Supplements Review

Learn What Olive Leaf Does and the Best Brands

Product Review

NAD Booster Supplements Review (NAD+/NADH, Nicotinamide Riboside, and NMN)

How Important Is Boosting NAD+ Levels? Find Out and Learn How Booster Supplements Compare.

NAD Boosters (NAD+/NADH, Nicotinamide Ribose, and NMN)

CL Answer

Do any supplements or diets help prevent or treat osteoporosis?

If you have osteoporosis, you may be interested in supplements or diets for bone health. Find out which can increase bone strength and density.

Doctor discussing osteoporosis with older female patient

CL Answer

What are the health benefits of tart cherry juice?

See the evidence for tart cherry juice health benefits from clinical studies. Find out if tart cherry has anti-inflammatory effects, if it can improve sleep, lower high blood pressure, or help for muscle pain and osteoarthritis.

Tart Cherry Benefits -- glass of cherry juice and two tart cherries

CL Answer

Could taking vitamin C (500 mg), CoQ10, grape seed extract, fish oil, vitamin D3/calcium/magnesium/zinc interfere with taking beta-sitosterol with dinner?

Learn about drug interactions & proper dosages for supplements such as CoQ10, vitamin D & C, fish oil, magnesium, zinc and grape seed extract.

Doctor Holding Handful of Fish Oil

Product Review

Vitamin C Supplements Review

Find the Best Vitamin C Supplements

Vitamin C Review 2023

Product Review

Vitamin E Supplements Review

Find the Best Vitamin E Supplement. Tests and Reviews of Popular Vitamin E Supplements & CL's Top Picks.

Vitamin E Supplements, Cream, and Oil Tested by ConsumerLab.com

Product Review

Calcium and Bone Health Supplements Review (Including Vitamins D & K, Magnesium and Boron)

See Which Bone Health Supplements Are Top Picks and Which Fail

CL Answer

Do any supplements naturally suppress appetite and help with weight loss?

Learn which natural ingredients can suppress appetite and find if these natural appetite suppressants help with weight loss.

Container of natural appetite suppressant supplement with measuring tape and scale in background

News Release

January 31, 2013

Use of CoQ10, Digestive Enzymes, Probiotics and B Vitamins on the Rise According to ConsumerLab.com Survey

White Plains, New York — February 1, 2013 — A recent survey of over 10,000 people who take supplements shows that CoQ10, digestive enzymes, probiotics, and B vitamins are the four categories experiencing the most growth over the prior year.

Product Review

Oat Cereals Review

Find the Best Oatmeal, Oat Bran, Steel Cut Oats, & Cold Cereals. Popular Oat Cereals Tested -- Beware of Unexpected Gluten.

Oat Cereals Tested by ConsumerLab.com

Product Review

Digestive Enzyme Supplements Review

Big Differences in Strength Found Among Digestive Enzyme Supplements. CL Tests Reveal Which Are Best.

Product Review

Magnesium Supplements Review (Including Calcium, Boron, and Vitamins D & K)

Find Out What Magnesium Does, Who Needs It, and Our Top Picks Among Supplements

CL Answer

Are there supplements I should avoid when taking apixaban (Eliquis) or similar blood thinner drugs like Xarelto?

Learn about supplement interactions with apixaban (Eliquis), rivaroxaban (Xarelto) and other blood thinner drugs in the direct factor Xa inhibitors class.

Eliquis Supplement Interactions -- box of Eliquis

CL Answer

10 Supplements That May Help Reduce Nighttime Urination (And 5 That May Not)

Waking up more than once during the night to use the bathroom? Learn more about the 9 supplements that may help and 5 others that don't.

A toilet in an empty bathroom at night

CL Answer

Which supplements should be taken with food?

Find out which supplements should be taken with food, including vitamins A, D, E, and K, fish oil, and CoQ10.

Woman holding a pill and showing it to a man while sitting at a table about to eat a meal

CL Answer

What supplements should I stop taking before surgery?

Info on which supplements to avoid before surgery due to increased risk of bleeding or interference with anesthesia.

Supplements to stop before surgery - operating room

CL Answer

What is GABA (gamma-aminobutyric acid)? Is it beneficial for stress, anxiety, insomnia or other conditions, and is it safe?

Find out about GABA (gamma-aminobutyric acid), including if it's beneficial for insomnia, epilepsy, stress and anxiety, high blood pressure and building muscle, and learn if taking GABA supplements is safe.

Older women sitting calmly on a couch with her hands behind her head and her eyes closed

CL Answer

Do any supplements help prevent or treat a cold?

Are there supplements that can help prevent or treat cold symptoms? Learn more about zinc, probiotics, vitamin C and more.

Supplements for Colds: Zinc, Echinacea & More -- Couple with cold, sitting on couch blowing their noses

CL Answer

Which supplements or foods can help lower cholesterol and keep my heart healthy? Are there any to avoid?

Information about heart health supplements & vitamins that help with cholesterol, including sterol esters, CoQ10, and vitamin D, and which may be bad for the heart, like calcium.

CL Answer

Does AHCC (active hexose correlated compound) have anticancer or antiviral benefits, and is it safe?

Learn about AHCC (active hexose correlated compound), including whether it is beneficial for liver, pancreatic, or prostate cancer, chemotherapy-related side effects, or the flu, and if it is safe.

Capsules of AHCC in wooden spoon in front of green leaf

CL Answer

What are the health effects of turkey tail mushroom and is it safe?

Learn about the possible health effects of turkey tail mushroom, including its use as adjuvant treatment for cancer and for boosting immune function, plus get information about possible side effects and find out why ConsumerLab has not yet tested turkey tail products.

Turkey tail mushrooms growing on the side of a tree

CL Answer

Which supplements can cause diarrhea?

Can supplements like magnesium cause diarrhea? Find out which supplements may cause diarrhea, such as vitamin B12, curcumin, magnesium, vitamin C and fish oil.

Which supplements can cause diarrhea? -- Woman with gastrointestinal pain

Recalls & Warnings

January 16, 2015

CVS Sued for Eye Health Supplement Claims

A class-action lawsuit has been filed against CVS for promoting the company's Advanced Eye Health supplement as comparable to the formula used in the large National Institutes of Health (NIH) eye disease study known as AREDS2, despite the fact that it does not contain the same ingredients.

Clinical Update

1/18/2014

Green Tea "Blocks" Beta-Blocker

A new study shows that drinking green tea can drastically reduce the amount of a beta-blocker (nadolol, Corgard) absorbed into the bloodstream. Beta-blockers are typically taken to lower blood pressure, raising concern for people using green tea along with this beta-blocker and, possibly, related medications. Get the details, along with our tests of green tea drinks and supplements, in the update to the Green Tea Review >>   

If you take a beta-blocker (which includes the popular drugs metoprolol (Lopressor, Toprol) and propranolol (Inderal)), be aware that chromium and CoQ10 may offer benefits.

Clinical Update

2/17/2023

Beta-Alanine for Thinking & Mood?

Can supplementing with beta-alanine improve cognitive function or mood in older men and women? Find out what a recent study showed in the Beta-Alanine section of our CL Answer about L-Carnosine (which contains beta-alanine).

Also, see our CL Answer about supplements for memory and cognition.

News Release

April 26, 2012

ConsumerLab.com reviews prostate supplements with saw palmetto and/or beta-sitosterol and finds few likely to be effective

White Plains, New York April 26, 2012 — Can supplements reduce the symptoms of prostate enlargement in men, as some products claim? ConsumerLab.com researchers recently tackled this question, investigating the evidence behind prostate supplements and testing the quality of these products.

Clinical Update

4/18/2023

Lowering Cholesterol with Beta-glucan?

Consuming oats, which contain beta-glucan, can help lower cholesterol. But do beta-glucan supplements help? See what a study showed in the Benefits section of our Oat Cereals Review, which includes our Top Picks among oat products.

Also see our article about supplements for heart health to learn which other supplements may help lower cholesterol.

Clinical Update

9/28/2022

Beta-glucan Supplements for Lowering Cholesterol?

Beta-glucan from cereals such as oats and barley may help lower cholesterol, but be aware that other sources of beta-glucan (including some supplements) may not. Find out in our CL Answer about supplements for heart health.

Recalls & Warnings

February 10, 2018

Warning to D-Limonene, Vitamin C Seller

On January 31, 2018 the FDA issued a warning letter to Long Life Unlimited, LLC following a review of the company's website which found promotional statements and testimonials made about products including Balance 600, D-Limonene, Rapha Remedy, Rapha Remedy w/ p73 Wild Oregano, Vitamin C, ...

Clinical Update

10/04/2011

Saw Palmetto May Not Work

It's used by many men hoping to reduce urinary symptoms caused by benign growth of the prostate, or BPH, but a new, well-designed study suggests that it doesn't work. Some other recent research suggest the same. Even when doubling and tripling the standard dose, the high-quality saw palmetto extract used in the new study failed to provide benefit.

What should you do? You may want to consider a different supplement -- beta-sitosterol, a phytosterol. The evidence remains fairly good for beta-sitosterol. To find out more about saw palmetto, beta-sitosterol, and the supplements we have tested, see the Prostate Supplements ReviewMore >>

Clinical Update

6/07/2022

Carnosine vs. Beta-alanine

Does beta-alanine, a constituent of L-carnosine, have similar effects to supplementing with L-carnosine itself? Find out what evidence suggests in our updated article about L-carnosine.

Clinical Update

6/24/2022

Beta-sitosterol & Bleeding Risk?

Does taking beta-sitosterol increase bleeding risk? Find out in the Concerns and Cautions section of our Prostate Supplements Review.

Clinical Update

4/15/2022

Mushrooms for Lowering Cholesterol?

The beta-glucan in oats can help lower elevated levels of cholesterol, but can the beta-glucan in mushrooms do the same? Find out in our article about Supplements and Foods for Lowering Cholesterol.

News Release

September 21, 2011

Not all vitamin A supplements pass ConsumerLab.com tests -- New report reviews beta-carotene and cod liver oil supplements

White Plains, New York — September 21, 2011 — Recent tests of vitamin A supplements by ConsumerLab.com found one to contain only 54.3% of its listed amount of vitamin A. Another product mislabeled alpha carotene as vitamin A.

News Release

June 16, 2011

ConsumerLab.com puts multivitamins to the test

June 16, 2011, New York, NY — Laboratory test results of 60 multivitamins have shown that you can't always judge a supplement by its label—or by its price. "Consumers should know that multivitamins vary widely in quality, "says Tod Cooperman, M.D., President of ConsumerLab.com.

News Release

September 15, 2009

ConsumerLab.com finds many prostate supplements have correct ingredients, but four fail review -- New report on 19 saw palmetto and beta-sitosterol supplements

White Plains, New York — Tuesday, September 15,2009 — ConsumerLab.com announced test results today from its newest Product Review of Prostate Supplements.

News Release

October 28, 2008

Tests reveal quality problems with vitamin A supplements -- New ConsumerLab.com report focuses on vitamin A, including beta-carotene and cod liver oil

WHITE PLAINS, NEW YORK — OCTOBER 28, 2008 — ConsumerLab.com is cautioning that the amount vitamin A in some supplements may be much higher or lower than the amount stated on labels. Among ten supplements recently selected for testing, ConsumerLab.

News Release

October 02, 2008

ConsumerLab.com finds melatonin supplements range in strength but ingredient quality is high

WHITE PLAINS, NEW YORK — OCTOBER 2, 2008 — ConsumerLab.com announced test results today from its new Product Review of Melatonin Supplements.  Melatonin supplements may help treat certain sleep disorders and disturbances, including jet lag.

Clinical Update

8/03/2019

Saw Palmetto for Prostate?

A recent clinical study is the latest to evaluate the potential benefit of saw palmetto in reducing symptoms of benign prostatic hypertrophy (BPH) in men. Find out what this, and previous studies, have shown in the What It Does section of the Prostate Supplements Review. Also see our Top Picks for saw palmetto and beta-sitosterol supplements.

Clinical Update

1/27/2024

Green Tea Interaction With Medicine

Drinking green tea may significantly affect blood levels of a common beta-blocker, as well as statins, blood-thinners, and thyroid medication. Be aware of these interactions. See the Concerns and Cautions section of our Green Tea Review.

Clinical Update

9/01/2023

Green Tea Interactions

Drinking green tea can affect the absorption of many drugs, as was most recently shown with raloxifene (Evista), a medication used to treat osteoporosis and reduce breast cancer risk. Learn about these interactions (including those with certain statins, beta-blockers, and blood thinners) in the Concerns and Cautions section of our Green Tea Review. Also see our Top Picks among green tea products.

Recalls & Warnings

February 13, 2013

Manufacturer of Heart, Multivitamin, Cranberry, and Longevity Supplements Warned For Adulteration and Drug Claims

On January 29, 2013, the FDA issued a warning letter to M.D.R. Fitness Corp. following a facility inspection which found violations of good manufacturing practices which cause the company's products to be adulterated. 

News Release

September 17, 2008

ConsumerLab.com's tests of menopause supplements reveal wide range in strength and quality; mislabeling and contamination discovered -- Soy and red clover isoflavones, black cohosh, and progesterone products tested

WHITE PLAINS, NY — September 17, 2008 — Risks associated with traditional hormone therapy for symptoms of menopause have increased public interest in alternative treatments, particularly dietary supplements. But a report today of recent tests by ConsumerLab.

News Release

August 12, 2008

ConsumerLab.com finds improvements in labeling of nutrition bars but potential pitfalls exist -- New report compares 20 bars, including those for protein, fiber, energy and whole food

WHITE PLAINS, NY — August 12, 2008 — Labeling on nutrition bars has become more accurate, according to a new report by ConsumerLab.com.

News Release

February 06, 2006

ConsumerLab.com finds most prostate supplements have correct ingredients, but three fail testing — Results posted for 22 supplements containing saw palmetto and beta-sitosterol

WESTCHESTER COUNTY, NEW YORK — FEBRUARY 6, 2006 — ConsumerLab.com announced test results today from its new Product Review of Prostate Supplements.

Recalls & Warnings

February 06, 2023

Recalled Eye Drops Linked to Vision Loss and One Death

On February 2, 2023, Global Pharma Healthcare issued a nationwide recall of its Artificial Tears Lubricant Eye Drops due to potential contamination with bacteria that can cause serious infection, blindness, and death.

Recalls & Warnings

October 10, 2014

Seller of Multivitamin Warned for Drug Claims

On September 25, 2014, the FDA issued a warning letter to Multimmunity, Inc., following a review of the company's website which found statements made about the dietary supplement Multimmunity to be drug claims.

Recalls & Warnings

December 15, 2020

FDA Warns Seller of Evening Primrose Oil and Beta Glucan

On December 2, 2020, the FDA issued a warning letter to Smoky Mountain Naturals, LLC following a review of the company's website, which found statements made about the company's products Evening Primrose Oil and Beta Glucan to be drug claims.

Recalls & Warnings

March 26, 2021

Nine Banned Stimulants Found in Workout, Weight Loss Supplements

Recent analysis of 17 brands of sports/energy and weight loss supplements sold in the U.S. found nine prohibited stimulants formulated into eight different combinations, and none of these combinations have been studied in people.

News Release

January 09, 2004

USANA products pass ConsumerLab.com screening for substances banned from Olympics

WHITE PLAINS, NY — January 9, 2004 — ConsumerLab.com announced today that six additional products have passed its Athletic Banned Substances Screening Program. ConsumerLab.com tested the products at the request of USANA, a supplement manufacturer. ConsumerLab.

Recalls & Warnings

January 19, 2022

FDA Warns Seller of Carnitine and Alpha Lipoic Acid Supplements

On November 18, 2021, the FDA issued a warning letter to GeroNova Research Inc.

Recalls & Warnings

May 14, 2021

Maker of Care by Design CBD Settles Charges of Unsupported Claims

On May 5, 2021, Cannacraft, Inc.

Recalls & Warnings

January 29, 2018

Seller of Male Enhancement, Prostate Supplements & More Warned for Drug Claims

On January 10, 2018, the FDA issues a warning letter to USA Labs AKA Power Source Distributors, Inc following a review of the company's website which found statements made about its products, including Maximum Male, Beta 300 (Beta Prosturol), Chromium Max 1000, DHEA, Healthy Cold-X and ...

Recalls & Warnings

February 02, 2021

Seller of Aloe Products Warned for Claiming to Treat Joint Stiffness

On January 22, 2021, the FDA issued a warning letter to American Global Health Group, LLC following a review of the company's website, which found statements made about the company's products AloeCure VeraFlex, AloeCure Advanced Formula Capsule, AloeCure Pure Aloe Vera ...

Recalls & Warnings

February 02, 2021

FDA Warns Seller of Reishi Mushroom Supplements

On January 6, 2021, the FDA issued a warning letter to Entia Biosciences, Inc following a review of the company's website, which found statements made about the company's products Lion's Mane - All Natural Supplement, Antrodia Mushroom Powder, Maitake Mushroom Powder, Reishi ...

Recalls & Warnings

February 02, 2021

FDA Warns Seller of Ginger, Echinacea, and More

On December 10, 2020, the FDA issued a warning letter to Prairie Dawn Herbs following a review of the company's website, which found statements made about the company's products Chest Tea, Ginger Oil, Dandelion root Tincture, Echinacea purpurea Tincture, Antispasmodic Tincture, ...

Recalls & Warnings

January 21, 2021

Federal Court Bars Fusion Health From Promoting Vitamin D for COVID-19

On January 8, 2021, the United States Department of Justice announced a permanent injunction has been entered, barring dietary supplement marketer Matthew Ryncarz and his companies Fusion Health and Vitality LLC dba Pharm Origins and Fusion Ionz LLC dba Pharm Origins from making claims that their ...

Recalls & Warnings

January 20, 2021

Seller of Omega-3 Warned for Making Claims to Treat Focus, Mood

On December 9, 2020, the FDA issued a warning letter to Bodyhealth.com, LLC following a review of the company's website, which found statements made about the company's products Healthy-Thin Energize, Body Detox (Oral Spray), and Omega 3 Health to be drug claims.

Recalls & Warnings

January 20, 2021

FDA Warns Seller of Vitamin D, Curcumin and CoQ10 Promoted for Treating COVID-19

On December 28, 2020, the FDA issued a warning letter to Smarter Nutrition, Inc. following a review of the company's website, which found statements made about the company's products Smarter Curcumin, Smarter Ubiquinol, and Smarter Vitamin D3 to be drug claims.

Recalls & Warnings

January 12, 2021

Seller of Cholesterol, Weight Loss Products, and More Warned for Claims

On November 17, 2020, the FDA issued a warning letter to Bonagens following a review of the company's website, which found statements made about the company's products Anti-Aging Supports, Cholesterol & Diabetes Control, Gout Control, Hypertension Control, Liver Supports, Lungs ...

Recalls & Warnings

January 12, 2021

FDA Warns Seller of Joint and Hair Loss Products

On December 22, 2020, the FDA issued a warning letter to Speedwinds Nutrition, Inc. following a review of the company's website, which found statements made about the company's products Synotrex and Sephren to be drug claims.

Recalls & Warnings

January 12, 2021

FDA Warns Seller of Turmeric, Ashwagandha, Glucosamine, and More

On December 18, 2020, the FDA issued a warning letter to Reddy Naturals following a review of the company's website, which found statements made about the company's products Glycostasis, Glucosamine Curcumin, Turmeric 50, Turmeric Curcumin, Cetyl Curcumin, Ashwagandha, Huruli, ...

Recalls & Warnings

May 19, 2020

FTC Sends Refund Checks to Consumers of Unproven Weight Loss and Sexual Enhancement Supplements

On May 19, 2020, the FTC announced it is mailing 143,636 checks totaling more than $8,500,000 to consumers who purchased deceptively marketed supplements.

Recalls & Warnings

April 02, 2021

FDA Warns Sellers of Prostate, Reishi, Immune Products, and More

On March 16, 2021, the FDA issued warning letters to two companies following reviews of their websites which found statements made about the companies' products to be drug claims.

Recalls & Warnings

May 02, 2017

Seller of Amino Acid Supplements & More Warned for Manufacturing Violations

On April 20, 2017 the FDA issued a warning letter to Naturecom Inc.

Recalls & Warnings

April 08, 2015

Does Your Weight Loss or Sports Supplement Contain Synthetic Amphetamine?

A study published on April 7, 2015, reported that among 21 weight loss, sports and cognitive enhancement supplements labeled as containing the plant extract Acacia rigidula, more than half were found to contain a synthetic, amphetamine-like compound called beta- methylphenylethylamine ...

Recalls & Warnings

August 06, 2016

Some Supplements May Cause or Exacerbate Heart Failure (Includes vitamin E and many herbs)

Taking certain supplements may be dangerous for people with heart failure, according to a statement from the American Heart Association (AHA) which was published in the journal Circulation (August 2, 2016). 

Recalls & Warnings

March 15, 2016

FDA Warns Sellers of Weight and Workout Supplements Containing Acacia Rigidula

On March 7, 2016, the FDA issued warning letters to five sellers of supplements which were labeled as containing Acacia rigidula, an ingredient which is not permitted in dietary supplements.

Recalls & Warnings

November 20, 2013

Another Meth-Like Compound Discovered In Weight Loss Supplements

A "non-natural" amphetamine-like compound, identified as beta-methylphenethylamine, was discovered in nine supplements recently tested by FDA scientists.

Recalls & Warnings

October 18, 2017

Total Body Nutrition Warned for Banned Stimulant in Supplements

On September 28, 2017, the FDA issued a warning letter to Total Body Nutrition following a facility inspection which found some of the company's products to be adulterated because they were prepared, packed, or held under conditions that violate Current Good Manufacturing Practices for dietary ...

Recalls & Warnings

December 12, 2014

Seller of B-12, Zinc, Echinacea and More Warned for Manufacturing Violations and Drug Claims

On November 14, 2014, the FDA issued a warning letter to Scientific Botanicals Company, Inc.

Recalls & Warnings

November 06, 2014

Seller of Prostate, Heart Supplements and More Warned for Drug Claims

On October 9, 2014, the FDA issued a warning letter to Health Research Laboratories, LLC/New World Health, following a review of the company's websites, which found statements made about AtheChel Advanced, Betarol, BioTherapex, Omega-3 Cardio Plus, RejuvaLifeRx, and Ultimate Health Formula to be ...

Recalls & Warnings

April 26, 2015

FDA Identifies More Products Listing Synthetic Amphetamine

On April 22, 2015, the FDA issued warning letters to sellers of weight loss and workout supplements that list a synthetic, amphetamine-like compound called beta- methylphenylethylamine (BMPEA) on product labels.

Recalls & Warnings

March 21, 2014

Homeopathic Products Recalled Due to Allergy Risk

On March 20, 2014, Terra-Medica, Inc. issued a voluntary recall of 56 lots of homeopathic products including, Pleo-FORT, Pleo-QUENT, Pleo-NOT, Pleo-STOLO, Pleo-NOTA-QUENT, and Pleo-EX.

Recalls & Warnings

February 15, 2013

Energy Drink Recalled Due To Bacterial Contamination

On December 21, 2012, NBTY issued a voluntary recall of the energy supplement MET-Rx Extreme Thermo Rage Watermelon 8 fl. oz. (Manufactured by MET-Rx Nutrition, Inc.) due to bacterial contamination.

Recalls & Warnings

January 21, 2014

"Stem Cell" Supplement Recalled Due to Allergen Risk

On January 19, 2014, Stemvida recalled StemAlive 90 Capsules because they were found to contain undeclared milk (labeled as bovine colostrum).

Recalls & Warnings

August 26, 2014

Seller of Immune Supplement Warned for Drug Claims

On August 12, 2014, the FDA issued a warning letter to Ad-Med Biotechnology, following a review of the company's websites and product labels, which found statements made about Immune Active Adult Formula and Immune Active Children's Formula to be drug claims. 

Recalls & Warnings

November 20, 2013

$2 Million In Weight Loss and "Fat-Burning" Supplements Seized

On November 12, 2013, U.S. Marshals seized more than $2 million worth of supplements from Georgia-based Hi-Tech Pharmaceuticals, Inc.

Recalls & Warnings

August 27, 2013

Immune Supplement Recalled Due To Undeclared Milk

On August 23, 2013, Reaction Nutrition, LLC issued a voluntary recall of immune support supplement LIVE CLINICAL 90 CAPS because it contains undeclared milk.

Recalls & Warnings

June 23, 2013

Weight Loss Supplements Containing DMAA Recalled

On June 15, 2013, dietary supplement retailor Beta Labs, LTD issued a recall of certain lots of "fat burner" and weight loss supplements Oxyphen XR, Phentalene, Phen FX and Red Vipers because they contain 1,3-dimethylamylamine (DMAA).

Recalls & Warnings

February 20, 2013

FDA Warns USPLabs For Adulteration and Drug Claims

On December 4, 2012 the FDA issued a warning letter to USPLabs, LLC following facility inspections which found the company's products, including dietary supplements Jacked3d, OxyElite Pro, Prime, and Super Cissus, to be adulterated because they were prepared, packed, or held under conditions that ...

Recalls & Warnings

February 07, 2013

Growth Factor Supplement For "Size, Strength and Stamina" Recalled Due To Potential Contamination

On January 2, 2013, EonNutra, LLC issued a voluntary recall of specific batches of Soto Supplements Growth Factor Complex 200 GFC 200 (2 fl oz.) liquid dietary supplement due to potential bacterial contamination.

Recalls & Warnings

January 23, 2013

USPLabs Settles Class Action Lawsuit Over Controversial DMAA Ingredient

On December 18, 2012, a settlement was approved in the class action lawsuit against USPLabs, which alleged the company's use of the ingredient DMAA (1,3-dimethylamine) in the supplements OxyELITEPRO and Jacked3d was not safe or legal.

Recalls & Warnings

July 09, 2010

FDA Issues Warning on Herbal Weight Loss Supplement

On July 8, 2010, the U.S. Food and Drug Administration (FDA) warned that Que She, marketed as an herbal weight loss supplement, contains active pharmaceutical ingredients not listed on the product label that could harm consumers, especially those with cardiovascular conditions.

Recalls & Warnings

May 30, 2015

Seller of Supplements for Herpes, Prostate Cancer & More Warned for Drug Claims

On May 7, 2015, the FDA issued a warning letter to Strictly Health Corporation, following a review of the company's websites which found statements made about FENVIR, Prosta Pep and Tonalin brand CLA to be drug claims.

Recalls & Warnings

April 29, 2015

FDA Targets Weight Loss and Workout Supplements Listing Synthetic Stimulant DMBA

On April 24, 2015, the FDA issued warning letters to sellers of weight loss and workout supplements that list a synthetic, amphetamine-like compound called 1,3-dimethylbutylamine (DMBA) on product labels. 

Recalls & Warnings

April 16, 2016

Workout Supplement Containing Acacia Rigidula Recalled

On March 18, 2016, Nubreed Nutrition, Inc. issued a recall of all lots of its "pre-workout" supplement Undisputed which is labeled as containing Acacia rigidula, an ingredient which is not permitted in dietary supplements. 

Recalls & Warnings

November 29, 2016

Seller of Mineral, Joint Supplements and More Warned for Manufacturing Violations, Drug Claims

On July 1, 2016, the FDA issued a warning letter to BioGenyx-Basic Reset, following a facility inspection which found the company's products, including Ionyte, Aqualyte, Beta Factor, Bee Gold and Primo Java to be adulterated because they were prepared, packed, or held under ...