Product Reviews and Information for Metabolic Syndrome
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Product Review
Ginseng Supplements Review
Find the Best Ginseng Supplement. Key "Ginsenosides" Found to Range 10-Fold Across Products.
Product Review
Magnesium Supplements Review (Including Calcium, Vitamins D & K, and Boron)
Find Out What Magnesium Does, Who Needs It, and Our Top Picks Among Supplements
CL Answer
What is hydrogen water? Is it beneficial for alertness, athletic performance, arthritis or other conditions, and is it safe?
Find out if hydrogen water has benefits with regard to alertness, side effects of radiotherapy in cancer patients, metabolic syndrome, athletic performance, rheumatoid arthritis, liver disease, and other conditions, and learn if it is safe to use.
Product Review
Berberine and Goldenseal Supplements Review
Tests Reveal the Best and Worst Berberine and Goldenseal Products
Clinical Update
12/11/2025
Moringa for Metabolic Syndrome?
Does moringa leaf powder improve blood sugar control and reduce weight among people with metabolic syndrome? Find out in our article about the health benefits and safety of moringa, which includes tips for choosing a moringa supplement.
Clinical Update
3/02/2016
Ginseng for Metabolic Syndrome?
A study in men with metabolic syndrome found no benefit on blood sugar levels from taking ginseng, but a small increase in testosterone. Get the details about this and other uses for ginseng, as well as our quality ratings in the Ginseng Supplements Review >>
Clinical Update
6/09/2018
Magnesium & Metabolic Syndrome
A study shows that magnesium can significantly help some people suffering from metabolic syndrome (i.e., high blood sugar, high blood pressure, and related symptoms). Get the details in the What It Does section of the Magnesium Supplements Review. Also see our Top Picks among magnesium supplements.
Clinical Update
12/10/2021
Magnesium for Metabolic Syndrome?
Can magnesium supplementation lower blood sugar and blood pressure in people with metabolic syndrome? Learn what a new study found in the What It Does section of the Magnesium Supplements Review. Also see our Top Picks among magnesium supplements.
Product Review
Probiotic Supplements Review (Including Pet Probiotics)
See What's Really in Probiotics and Our Top Picks
CL Answer
Are Moringa Leaf Supplements Helpful and Safe?
Are moringa leaf supplements beneficial for diabetes, lowering cholesterol, lowering blood pressure, improving liver function, and other conditions, and are they safe? Find out.
CL Answer
Which supplements and foods can help lower or control blood sugar?
Find out which supplements can help lower or control blood sugar. Supplements including turmeric/curcumin, fiber, cinnamon, and ginseng are believed to help lower blood sugar.
Product Review
Resveratrol Supplements Review (From Red Wine, Knotweed, and Other Sources)
See Which Resveratrol Supplements Were Best In Our Tests and Comparisons. Learn What Resveratrol Can and Can't Do.
CL Answer
Do any supplements help with fatty liver disease? Are some diets more beneficial than others?
Find out if supplements such as vitamin E, fish oil, milk thistle, curcumin, choline, probiotics, vitamin D, reishi mushroom, or extra virgin olive oil are beneficial for fatty liver disease and learn which diet (Mediterranean, ketogenic, DASH, or fasting diets) seems to have greatest benefit.
CL Answer
Resistant Starch: Health Benefits & Safety
Resistant starches have been promoted for improving bowel function, blood sugar control, reducing risk factors of metabolic syndrome, and for weight loss. Find out if they work.
Product Review
Red Yeast Rice Supplements Review
Only 2 of 7 Red Yeast Rice Supplements Approved in CL Tests
CL Answer
Does TA-65 Astragalus Extract Increase Telomere Length and Longevity?
TA-65 Astragalus Extract is promoted to increase telomere length. Find out if there is evidence for this, if this increases lifespan or longevity, plus safety, side effects and cost.
Clinical Update
5/01/2021
Does Kefir Lower Cholesterol?
Can drinking kefir that contains probiotics, decrease LDL cholesterol or triglyceride levels in people with metabolic syndrome? See what a new study found the Cholesterol-Lowering section of our Probiotic Supplements Review. Also see our Top Picks among probiotic supplements and drinks.
Clinical Update
2/10/2017
High-Dose Resveratrol Increases "Bad" Cholesterol
A study of middle-aged men with metabolic syndrome found that high doses of resveratrol increased levels of "bad" LDL cholesterol. Get the details in the "What It Does" section of the Resveratrol Supplements Review (which includes our tests of products) >>
Product Review
Green Tea Review: Tea Bags, Loose Leaf Tea, Matcha Powders, and Supplements
Some green teas provide barely any green tea polyphenols, while some others are high strength. See the Test Results and Our Top Picks for Green Tea.
Product Review
Turmeric and Curcumin Supplements and Spices Review
See Our Top Picks Among Turmeric Products
CL Answer
What is inositol hexaphosphate (IP6) and myo-inositol? Are they helpful in treating cancer or other conditions?
Inositol hexaphosphate (IP6): Find out if IP6 (also known as phytic acid) can prevent or treat cancer. Clinical evidence, dosage, safety and how IP6 differs from myo-inositol. Consumerlab.com's answer explains.
Product Review
CLA (Conjugated Linoleic Acid) Supplements Review (for Slimming)
Choose the Best CLA Supplement. Not All CLA Supplements Contain What You Expect.
Product Review
Acetyl-L-Carnitine Supplements Review
Choose the Best Acetyl-L-Carnitine Supplement. Don't Overpay! CL Identifies Quality Acetyl-L-Carnitine Supplements at the Best Value.
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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
Is it true that eating Brazil nuts can help with weight loss? Are there other health benefits or risks of Brazil nuts
Learn more about vitamin E intake from nuts, including Brazil nuts, hazelnuts, and almonds.
CL Answer
Which supplements can help lower my triglycerides?
Find out whether fish oil supplements, or plant-based oil supplements, such as flaxseed oil and echium oil are best for lowering triglyceride levels. ConsumerLab.com's answer explains.
Product Review
Rolled Oats and Steel-Cut Oats Review
Find the Best Rolled and Steel-Cut Oats -- Beware of Unexpected Gluten.
Product Review
Shelled Walnuts (Halves & Pieces)
See Our Top Picks for Walnuts
Product Review
Quercetin & Rutin Supplements Review
Quality's a Concern With Quercetin and Rutin Supplements -- Only 17% of Claimed Amount In One
Product Review
Reishi Mushroom Supplements Review
Find the Best Reishi Mushroom Supplement. See How Reishi Supplements Differ.
CL Answer
What are the health benefits of luteolin, and is it safe?
Find out if luteolin, a compound found in many fruits and vegetables, is beneficial for cancer, heart health, skin aging, age-related cognitive decline, and other conditions, and learn if it's safe.
CL Answer
Does Gynostemma pentaphyllum really work as an AMPK activator and help for diabetes, high cholesterol, or weight loss?
Find out if Gynostemma pentaphyllum ( jiaogulan) works as an AMPK activator and helps to lower blood sugar and treat diabetes. ConsumerLab.com's answer explains.
Product Review
Cinnamon Supplements and Spices Review
CAUTION: Limit Use of Some Cinnamon Due to Liver Toxin. See Our Findings and Top Picks.
CL Answer
Best Supplements to Prevent Age-Related Muscle Loss
Discover the top supplements to prevent age-related muscle loss after 60. Learn how protein, fish oil, vitamin D, and more can help maintain muscle strength and combat sarcopenia.
Product Review
L-Tryptophan and 5-Hydroxytryptophan (5-HTP) Supplements Review
Choose the Best L-Tryptophan and 5-HTP Supplements. CL Tests Identify High Quality L-Tryptophan and 5-HTP (5-Hydroxy-L-Tryptophan) at the Best Value.
CL Answer
Is it possible to take too much vitamin C?
Find out the daily value of vitamin C, along with possible side effects of excessive vitamin C intake. ConsumerLab explores the topic of proper vitamin C supplement usage, and why taking too much can be harmful.
CL Answer
10 Supplements That May Boost Testosterone (And 13 That May Not)
Many supplements promise to increase testestorone, boost libido, and increase muscle size, but, as ConsumerLab explains, the actual effectiveness of supplements is limited, and some supplements may actually reduce testosterone levels.
CL Answer
Is the Resurge supplement a scam? I'm having trouble getting a refund.
Resurge supplement scam? ConsumerLab has received several complaints from unhappy consumers who purchased Resurge and said they did not receive the product or a refund.
CL Answer
Which supplements can help to lower blood pressure?
Supplements to lower blood pressure, including CoQ10, vitamin C, fish oil, and olive oil, are all explored to find out what works.
CL Answer
A tea called Throat Coat made me lethargic and I was found to have low potassium. Is this a known problem? I was drinking 5 cups a day.
Throat Coat tea information, including licorice root content, potassium loss, and symptoms such as lethargy, increased blood pressure and fluid retention. ConsumerLab.com's answer explains.
CL Answer
Do any supplements help reduce menstrual pain or symptoms of premenstrual syndrome (PMS)?
Find out which supplements help reduce premenstrual syndrome (PMS) symptoms, such as mood swings, pain, bloating, irritability and food cravings.
CL Answer
I have IBS and don't want to take medication if I can help it. I've heard that peppermint works for IBS, but is there good research to support this?
Information about using peppermint oil for irritable bowel syndrome (IBS), including clinical evidence, dosage, safety and more.
CL Answer
Are There Supplements That Help Treat POTS (Postural Orthostatic Tachycardia Syndrome)?
Find out which supplements and lifestyle changes may be helpful for people with Postural Orthostatic Tachycardia Syndrome (POTS).
CL Answer
Do any supplements help with restless legs syndrome?
Find out whether supplements or vitamins like iron, magnesium, vitamin E and others can help for restless leg syndrome (RLS). ConsumerLab.com's answer explains.
CL Answer
Can baking soda really help treat rheumatoid arthritis?
Find out if there is evidence showing that baking soda (sodium bicarbonate) can help for rheumatoid arthritis. Plus, get information about safety and drug interactions with baking soda. ConsumerLab.com's answer explains.
CL Answer
I developed a rash soon after starting a probiotic. Is it possible to be allergic to probiotics?
Find out if probiotics can cause allergic reactions, including skin rashes, and why.
CL Answer
Has the probiotic VSL#3 been changed or discontinued? Is Visbiome a good alternative?
Find out if the probiotic formula VSL#3 has been changed and how it compares with Visbiome. ConsumerLab.com's answer explains.
News Release
April 15, 2026
Think Expensive NAC Is Better? ConsumerLab Tests Say Otherwise
White Plains, NY, April 15, 2026 — NAC (N-acetyl cysteine) supplements are widely marketed for “detoxification,” immune support, and respiratory health, as NAC is converted in the body into the antioxidant glutathione.
CL Answer
Is canola oil good or bad for you? I heard it can be toxic.
Find out if canola oil is bad for you or good for you, and whether it helps heart health. Clinical evidence and how it compares to other oils.
CL Answer
I take fluoxetine (Prozac), a SSRI drug to treat depression. Are there supplements I should avoid, or be taking, due to this drug?
Learn about Prozac (fluoxetine) drug interactions along with other supplements and SSRIs.
CL Answer
Dihydromyricetin (DHM) – Does It Help and Is it Safe?
Dihydromyricetin (DHM) is promoted for liver health, diabetes, lowering cholesterol, and as a hangover remedy. Find out if it works and whether it is safe.
CL Answer
What are the benefits of Daily Synbiotic by Seed Health? Does it do what it claims, and is it better than other probiotics and prebiotics?
Review of Daily Synbiotic by Seed, including information about the prebiotic and probiotic strains in the supplement, and whether there is evidence of benefit for the synbiotic.
CL Answer
What are the health effects of apigenin and is it safe?
Apigenin, a flavonoid compound, is promoted for sleep, depression, cancer, and other conditions. Find out if it works and if it's safe.
News Release
September 14, 2023
Best and Worst Berberine and Goldenseal Supplements, According to ConsumerLab Tests
White Plains, New York, September 14, 2023 — Recent ConsumerLab tests revealed problems with nearly 45% of the berberine and goldenseal supplements selected for testing. Powders and capsules containing goldenseal (which naturally contains berberine) were particularly likely to have issues.
Product Update
3/26/2026
Pendulum Probiotic Approved
Pendulum Metabolic Daily was recently tested and Approved through our voluntary Quality Certification Program and added to our Probiotic Supplements Review.
Clinical Update
5/05/2023
Restless Leg Syndrome: GABA vs Gabapentin
One of these can help with restless leg syndrome, while the other doesn’t. Learn the difference in our GABA Supplements Review, which includes our Top Picks for GABA.
Also see our article about supplements for restless legs syndrome.
CL Answer
Which supplements may help with PCOS (polycystic ovarian syndrome)?
Many supplements are promoted to help treat symptoms of PCOS (polycystic ovarian syndrome), but do they really work? See the clinical evidence for inositol (myo-inositol and D-chiro-inositol), alpha lipoic acid, vitamin B-12, folic acid, vitamin D and more.
CL Answer
Dimethyl sulfoxide (DMSO): Health Effects & Safety Concerns
Dimethyl sulfoxide (DMSO) is a colorless liquid promoted for osteoarthritis, interstitial cystitis, tennis elbow, rotator cuff tendonitis, wound healing, and many other conditions. Find out if it works and if it's safe.
Clinical Update
2/27/2024
Alpha Lipoic Acid & Fatty Liver Disease
Does alpha lipoic acid help with metabolic fatty liver disease? See what research shows in our Alpha Lipoic Acid Supplements Review. Also see our Top Picks among alpha lipoic acid supplements.
Clinical Update
5/04/2024
L-Citrulline for Fatty Liver?
Does taking L-citrulline decrease liver fat or have other benefits in people with metabolic-associated fatty liver disease (MAFLD)? See what a recent study found in the What It Does section of our L-Citrulline Supplements Review, which includes our Top Picks among L-citrulline supplements.
Also see: Do any supplements help with fatty liver disease? Are some diets more beneficial than others?
Clinical Update
4/14/2023
When to Get Protein
For older people, a new study suggests that the timing of protein intake during the day may be important, although more research is needed. Get the details in the When to take section of our Protein Powders and Shakes Review. Also find out when to take protein around exercise for greater metabolic improvement and fat loss.
See our Top Pick among protein powders.
Clinical Update
2/26/2012
CLA For Weight Management
A new study in obese individuals found that taking a supplement with CLA (conjugated linoleic acid) for twelve weeks reduced body fat and, to a lesser degree, body weight. But CLA has other metabolic effects that need to be considered. See the update to the CLA Supplements Review which has details on dosage and potential side effects, as well as our product tests. More >>
Clinical Update
5/10/2015
Flaxseed Oil for Improving Cholesterol?
A recently published study looked at the metabolic effects of taking daily flaxseed oil on middle-aged men. It found a possible benefit among those with higher triglyceride levels, but overall results were not impressive. More about the study, flaxseed oil, whole flaxseed, and our tests and comparisons of products, is found in the Flaxseed Oil, Evening Primrose Oil, Borage Oil, and Black Currant Oil Supplements Review >>
CL Answer
Which supplements help with Raynaud's phenomenon?
Raynaud's phenomenon may be helped by some supplements. Learn more about fish oil, Gingko biloba, and ginseng.
CL Answer
Which supplements help to improve energy and decrease fatigue?
Energy supplements and vitamins - Some can help increase energy and reduce fatigue, including CoQ10, curcumin/turmeric, cocoa, and B vitamins.
Clinical Update
7/13/2018
Melatonin and Restless Legs Syndrome
Taking a melatonin supplement can help some people fall asleep, but a study suggests that it may be a problem for people with restless legs syndrome. Get the details, and learn about potential side effects of melatonin in the Concerns and Cautions section of the Melatonin Supplements Review.
Clinical Update
12/07/2021
Can Warm Coffee Trigger Burning Mouth Syndrome?
A member asked if anyone else had experienced "burning mouth syndrome" after drinking warm coffee. Find out if drinking coffee can trigger symptoms of this known condition in the Safety section of our updated article about Coffee and Heart Health.
Clinical Update
6/30/2013
Probiotic for Irritable Bowel Syndrome?
A popular probiotic given in a yogurt appeared to reduce symptoms in people with irritable bowel syndrome. However, people taking a yogurt without the probiotic did just as well, if not better, over time, raising doubt about the value of the probiotic. For more details, as well as test results and comparisons for 29 probiotic supplements, see the updated Probiotic Supplements Review >>
Clinical Update
7/18/2023
Probiotic for IBS?
Did taking a probiotic further reduce symptoms of irritable bowel syndrome in people on a low-FODMAP diet? Find out in the IBS section of our Probiotics Supplements Review.
Also see: Do any supplements help for irritable bowel syndrome (IBS)?
Clinical Update
5/07/2024
Probiotic for IBS
Can a probiotic (live or heat-treated) reduce symptoms of diarrhea-predominant irritable bowel syndrome? Find out what a recent study showed in the IBS section of our Probiotic Supplements Review. Also see our Top Picks among probiotics.
Also see: Do any supplements help for irritable bowel syndrome (IBS)?
Clinical Update
5/10/2024
Magnesium, Sleep Apnea & Restless Legs
Does taking magnesium help with sleep apnea? Does it help with restless legs syndrome? These questions are addressed in our Magnesium Supplements Review, which includes our Top Picks among magnesium supplements.
Also see: Do any supplements help with restless legs syndrome?
Clinical Update
8/12/2024
Vitamin D for Restless Legs?
Did taking vitamin D reduce the severity of restless legs syndrome in women? See what a recent study found in the Restless legs syndrome (RLS) section of our Vitamin D Supplements Review, which includes our Top Picks for vitamin D.
Clinical Update
8/19/2024
Iron for Restless Legs Syndrome?
Is it true that taking iron can improve symptoms of restless legs syndrome? Find out in our Iron Supplements Review, which includes our Top Picks for iron.
Clinical Update
9/30/2024
Valerian for Restless Legs?
Does taking valerian root reduce the severity of restless legs syndrome? See what clinical evidence shows in our Valerian Supplements Review, which includes our Top Picks among valerian supplements.
Also see: Do any supplements help with restless legs syndrome?
Clinical Update
1/11/2022
Ginkgo and Cistanche for Chronic Fatigue Syndrome?
Does supplementing with ginkgo and cistanche extracts help reduce symptoms of chronic fatigue syndrome? See what a recent study showed in our updated answer to the question: Which supplements help to improve energy and decrease fatigue?
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.
CL Answer
Will pregnenolone help slow down aging or reduce chronic pain?
Learn more about the steroid hormone pregnenolone, including its effects in the body and on aging and chronic pain.
Clinical Update
8/18/2023
Inositol for PCOS?
See if a panel of experts recently recommended inositol for PCOS (polycystic ovarian syndrome) in our article about Inositol for PCOS.
Clinical Update
8/14/2021
J&J Vaccine Blood Clot, Guillain-Barre Risk
How common are blood clots and low platelet counts or Guillain-Barre syndrome after the J&J vaccine?
Clinical Update
6/17/2022
Supplements for POTS?
People with postural orthostatic tachycardia syndrome (POTS) experience a fast heart rate, dizziness, and other symptoms when standing. Can any supplements or lifestyle changes help? Find out in our answer to the question: Are there supplements that help treat POTS?
Clinical Update
10/18/2022
Fenugreek for PCOS?
Can supplementing with fenugreek extract improve symptoms of polycystic ovarian syndrome (PCOS)? Find out what a recent study suggests in our updated article about Supplements and PCOS.
Clinical Update
9/26/2023
Creatine for Post-COVID Fatigue?
Does supplementing with creatine reduce fatigue or other symptoms in people with post-COVID fatigue syndrome? Find out what a recent study showed in the Creatine - What It Does section of our Muscle & Workout Supplements Review. Also see our Top Picks for creatine.
Also see: How Should You Take Care of Yourself After You’ve Had COVID-19?
Clinical Update
6/03/2022
Digestive Enzymes for IBS?
Does taking digestive enzymes reduce symptoms of irritable bowel syndrome (IBS)? Find out in our updated Digestive Enzyme Supplements Review.
Clinical Update
7/11/2023
Arthritis Supplement May Have Caused Cushing Syndrome
We’ve added more information about the risks of a supplement for joint pain sold by Walmart. Get the details.
Clinical Update
2/10/2025
PEA for Menstrual Pain?
Does taking PEA (palmitoylethanolamide) reduce menstrual cramp pain? Find out what a recent study showed in our article: What are the health benefits of palmitoylethanolamide (PEA), and is it safe?
Also see: Do any supplements help reduce menstrual pain or symptoms of premenstrual syndrome (PMS)?
Clinical Update
6/05/2025
Supplements for IBS?
Find out if probiotics, peppermint, or melatonin were considered to be beneficial by pediatric experts for treating irritable bowel syndrome in kids and teens.
Clinical Update
6/24/2025
Apigenin for Menopause or PCOS?
Can taking apigenin (from chamomile) alleviate menopausal symptoms or help with polycystic ovary syndrome? Find out what recent studies suggest in our article about the safety and health effects of apigenin.
Clinical Update
7/18/2025
Fish Oil for Burning Mouth?
Did taking fish oil help reduce pain in people with burning mouth syndrome (which causes unexplained scalding sensations in the mouth)? Find out what a recent study showed in the What It Does section of our Fish Oil Supplements Review, which includes our Top Picks.
Clinical Update
2/02/2024
Probiotic for IBS?
Did a multi-strain probiotic improve symptoms of irritable bowel syndrome in a recent study? Find out in the Symptoms of IBS section of our Probiotics Supplements Review. Also find out which product containing this specific multi-strain probiotic was tested and Approved by ConsumerLab.
Clinical Update
5/14/2024
Melatonin and Restless Legs
Melatonin may help some people fall asleep faster, but might it worsen symptoms in people with restless legs syndrome (RLS), which makes sleeping more difficult? Find out in the Concerns and Cautions section of our Melatonin Supplements Review, which includes information about other potential side effects, as well as interactions, with melatonin.
Clinical Update
3/31/2013
More Iron, Less PMS?
A new study showed that women getting more iron had a significantly lower risk of suffering PMS (premenstrual syndrome) -- but not just any type of iron. Get the details, as well as our ratings of iron supplements, in the updated Iron Supplements Review »
Clinical Update
1/20/2013
More Probiotic Concerns
According to a published case report, two women recently developed a severely debilitating condition ("eosinophilic syndrome") two to four weeks after taking what appears to be the same "new" probiotic supplement. It's not yet known if these are isolated cases or are there more to come. For more information, see the recent update to the Probiotic Supplements Review >>
Clinical Update
1/02/2011
Probiotics and Irritable Bowel Syndrome (IBS)
A recent study of children with IBS found that eight weeks of treatment with a probiotic greatly reduced the frequency and severity of abdominal pain. See the Probiotic Supplements Review for the type and dose of probiotic used and more >>
Clinical Update
8/04/2013
5-HTP Concern
Three cases of eosinophilia-myalgia syndrome (EMS) have been reported among people taking 5-HTP, a compound related to L-tryptophan. EMS is a debilitating immune condition which has occurred in people taking L-tryptophan, but there were no previous reports of it being caused by 5-HTP. Get the details in the the updated review article on L-Tryptophan and 5-HTP >>
Clinical Update
12/17/2014
Probiotic Reduces GI Pain in IBS
A yeast-based probiotic was recently shown to significantly reduce abdominal pain and discomfort among people with irritable bowel syndrome (IBS). The most notable effect occurred after 4 weeks of use. Other studies, typically using bacterial probiotics, have also shown some benefit in IBS. For details, see the Probiotic Supplements Review >>
Clinical Update
5/25/2014
Probiotic for IBS Symptoms
A recent study found that a multi-strain probiotic reduced certain symptoms of irritable bowel syndrome (IBS). Get the details, as well as our tests of probiotic products, in the updated Probiotic Supplements Review >>
Clinical Update
3/02/2016
Probiotic Helps with IBS
A probiotic was found to improve many symptoms of irritable bowel syndrome in a recent study. Studies with other probiotics have also shown benefits, but be aware that the choice of probiotic seems to depend on the type of IBS. Get the details, as well as our quality ratings, in the Probiotic Supplements Review >>
Clinical Update
10/06/2015
Probiotic Improves IBS Symptoms
A probiotic significantly improved symptoms in men and women with a particular type of irritable bowel syndrome (IBS), according to a recent study. Get the details, including dosage, and our tests of popular products, in the Probiotic Supplements Review >>
Clinical Update
5/24/2017
POTS and Thiamin
A small study among people who suffer from POTS (postural tachycardia syndrome) suggested that supplementing with thiamin (vitamin B-1) may help some. For details, see the Thiamin (B-1) section of the B Vitamin Supplements Review >>
Clinical Update
8/02/2017
Iron for Restless Legs
Iron supplementation may help to reduce the severity of restless legs syndrome (RLS) symptoms in people who have deficient or low levels of iron, according to guidelines from the American Academy of Neurology. For details, including dosage, see the "What It Does" section of the Iron Supplements Review, which also includes our tests and quality comparisons of products.
Clinical Update
10/02/2021
Human Milk Oligosaccharides (HMOs) for IBS?
Are symptoms of IBS improved with use of human milk oligosaccharides (HMOs)? Find out what research suggests in our answer to the question: Do any supplements help for irritable bowel syndrome (IBS)?
Clinical Update
8/03/2021
Vitamin D for IBS?
Can vitamin D supplementation reduce the severity of symptoms in people with irritable bowel syndrome (IBS)? See what a new study found in the What It Does section of our Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Clinical Update
8/07/2021
Peppermint Oil for IBS?
Can peppermint oil supplements improve symptoms in people with irritable bowel syndrome (IBS)? See what a new study found in our updated article about Peppermint Oil and IBS.
Clinical Update
9/29/2020
Vitamin D and PCOS
Can vitamin D improve symptoms of (polycystic ovary syndrome (PCOS)? Find out what a recent study showed in the What It Does section of Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Clinical Update
12/01/2018
Vitamin D for Restless Legs?
Does high-dose vitamin D help women and men with restless legs syndrome? Find out what a recent study reported in the What It Does section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D.)
Clinical Update
9/04/2018
Glutamine for IBS?
Glutamine, an amino acid, plays a role in maintaining the digestive tract. Can taking it as a supplement help people with irritable bowel syndrome (IBS)? Find out what a recent study showed in the Glutamine section of the Muscle Enhancers Review.
Clinical Update
5/26/2017
Probiotic Reduces Depression in IBS
A probiotic significantly decreased depression in men and women with irritable bowel syndrome (IBS), according to a recent study. For details, see the "What It Does" section of the Probiotic Supplements Review >>
Clinical Update
6/12/2019
Reaction to CoQ10 and Alpha-Lipoic Acid
An autoimmune syndrome possibly caused by CoQ10 was recently reported. It is similar to rare cases caused by alpha-lipoic acid. For details see the updates to the Concerns and Cautions sections of the CoQ10 and Alpha Lipoic Acid Reviews.
Clinical Update
6/18/2019
Melatonin for PCOS?
Can melatonin help women who suffer from polycystic ovary syndrome (PCOS)? See what a recent study found in the What It Does section of the Melatonin Supplements Review. Also see our Top Picks for melatonin.
Clinical Update
1/23/2016
Vitamin D Reduces PMS Symptoms
A recent study found that taking vitamin D significantly improved symptoms of premenstrual syndrome (PMS) in young women who were deficient in vitamin D. Get the details in the Vitamin D Supplements Review >>
Clinical Update
6/12/2018
Probiotic for IBS?
Studies have shown that certain probiotics help relieve symptoms of irritable bowel syndrome (IBS), although this can depend on the type of IBS. The most recent study focused on people with diarrhea-predominant IBS. Get the results in the What It Does section of the Probiotic Supplements Review. Also see our Top Picks among probiotics.
Clinical Update
9/09/2025
PEA for IBS?
Does taking PEA (palmitoylethanolamide) improve symptoms of irritable bowel syndrome (IBS)? See what research suggests in the Health effects section of our article about PEA.
Clinical Update
9/16/2025
Myo-inositol for PCOS?
Did taking myo-inositol reduce adverse events, including preterm birth, in women with polycystic ovary syndrome (PCOS)? Find out what a recent study showed in our article about myo-inositol.
Clinical Update
12/18/2025
Berberine for PCOS?
Can berberine help with polycystic ovary syndrome (PCOS)? Find out in our Berberine Supplements Review, which includes our Top Picks for berberine.
Clinical Update
1/12/2026
PEA for Restless Legs?
Does taking PEA (palmitoylethanolamide) help with restless legs syndrome (RLS)? Find out what a recent case suggests in our article about the health effects and safety of PEA.
Recalls & Warnings
September 13, 2013
Metagenics Warned For Misbranding of Medical Foods and Drug Claims
On August 13, 2013, the FDA issued a warning letter to Metagenics, Inc.
News Release
April 14, 2020
ConsumerLab Tests Reveal Best Probiotic Supplements and Those With Quality Issues
White Plains, New York, April 14, 2020 — Probiotic supplements may be helpful for conditions including antibiotic-associated diarrhea, irritable bowel syndrome, and respiratory infections.
Recalls & Warnings
December 07, 2023
Belmont Eyecare Warned for Colloidal Silver, MSM, and Castor Oil Eye Drop Claims
On December 1, 2023, the FDA issued a Warning Letter to Belmont Eyecare LLC, following a review of the company’s website, which found statements about the company’s Colloidal Silver Eye Drops, MSM Eye Drops, Organic Daytime Oil Eye Drops, Organic Daytime Oil Eye Drops Small, Organic ...
News Release
July 31, 2018
Best L-Tryptophan and 5-HTP Supplements Identified by ConsumerLab -- ConsumerLab Tests Strength and Purity of Supplements for Sleep and Mood
White Plains, New York, July 31, 2018 — L-tryptophan supplements are often promoted to improve sleep and 5-HTP supplements to help with depression.
News Release
May 02, 2018
Best Probiotic Supplements and Kombuchas? -- ConsumerLab Tests 41 Popular Products, Reveals Problems and Top Picks
White Plains, New York, May 2, 2018 — With so many different probiotic supplements on the market, each providing different amounts and strains of beneficial bacteria or yeast, choosing the right one can be an overwhelming task.
News Release
December 12, 2017
Berberine and Goldenseal: Avoid Fakes! -- ConsumerLab.com Testing Reveals the Best and Worst Supplements
White Plains, New York, December 12, 2017 — Berberine, a compound found in goldenseal root, may help to lower blood sugar in certain people, and may have other potential benefits. However, ConsumerLab.
News Release
December 06, 2016
Which Brands of Alpha Lipoic Acid are Best? -- ConsumerLab.com Tests Lipoic Acid Supplements for Quality, Identifying Top Picks
White Plains, New York, December 6, 2016 — Alpha-lipoic acid supplements may improve insulin sensitivity and blood sugar control in people with type 2 diabetes, reduce symptoms of diabetic peripheral neuropathy, and enhance weight loss when dieting.
News Release
March 12, 2012
Review of vitamin C supplements by ConsumerLab.com finds many of high quality but a wide range in prices
White Plains, New York — March 8, 2012 — Vitamin C may boost the immune system and is critical for maintaining healthy connective tissue, but do you need to take a supplement and, if so, how do you find one that is right for you and at the best price? ConsumerLab.
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.
Recalls & Warnings
August 12, 2024
FDA Warns "Apricot Power" Apricot Seeds Contain Toxic Compound
On May 24, 2024, the FDA warned consumers not to consume three Apricot Power bitter apricot seed products because they were found to contain the toxic compound amygdalin.
Recalls & Warnings
March 01, 2023
Seller of Dr. Miller’s Herbal “Detox” Teas Warned by FDA for Drug Claims
On February 3, 2023, the FDA issued a warning letter to Jackson Health & Wellness Clinic after inspection of the company’s website found statements about the company’s Dr. Miller’s Holy Tea, Dr. Miller’s Super Holy Tea, Dr. Miller’s Ultimate Tea, Dr.
Recalls & Warnings
June 02, 2022
Walmart Inc. Recalls Joint Supplements With Omega-3, Glucosamine & Curcumin
On May 28, 2022, Walmart Inc. issued a voluntary recall of all lots of Artri Ajo King Joint Supplements after FDA laboratory analysis found the presence of undeclared diclofenac.
Recalls & Warnings
October 02, 2023
Dangerous Ingredients Found in Ten Arthritis and Pain Supplements
On September 29, 2023, the FDA warned consumers that the following arthritis and pain management products contain undeclared drugs such as diclofenac, methocarbamol (a muscle relaxant), and dexamethasone (a corticosteroid), and/or other potentially harmful ingredients.
Recalls & Warnings
February 22, 2021
FDA Warns Seller of Melatonin & Other Sleep Supplements
On February 18, 2021, the FDA issued a warning letter to SANA Group LLC following a review of the company's website, which found statements made about the company's products Sleep Sana Sleep Drops and Sleep Shots to be drug claims.
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
April 27, 2022
Prescription Drugs Found in Arthritis, Muscle Pain, and Osteoporosis Supplements
On April 20th, 2022, the FDA warned consumers not to use the following ”Artri“ or ”Ortiga” products promoted to treat arthritis, muscle pain, osteoporosis and bone cancer because they have been found to contain undeclared drugs that can have serious adverse ...
Recalls & Warnings
September 14, 2021
Seller of Lion's Mane, Other Mushroom Supplements Warned by FDA
On July 20, 2021, the FDA issued a warning letter to Brilliant Enterprises LLC because it found statements made on the company's website and social media about mushroom supplements, including Lion's Mane, BoomChaga, CordaCex, and LVL:MAX to be drug claims.
Recalls & Warnings
October 06, 2011
Testosterone Booster Supplement Recalled for Containing Synthetic Steroid
On October 5, 2011, the U.S. FDA announced that Superior Metabolic Technologies Inc of Marietta, Georgia is voluntarily recalling all lots of the testosterone booster Uprizing 2.
Recalls & Warnings
April 17, 2020
Seller of Vitamin D, MSM, Selenium & More Warned for Drug Claims
On March 31, 2020, the FDA issued a warning letter to KetoKerri LLC following a review of the company's website, which found statements made about some of the company's products, including Dr.
Recalls & Warnings
January 24, 2020
Fat-Burning, Energy Supplement Linked to Heart Trouble
A 33-year-old woman in Australia developed cardiac ischemia (a lack of blood flow to the heart) after taking the "fat burning" supplement Alpha Lean-7, according to a recent report in the Journal of Sports Sciences.
Recalls & Warnings
April 03, 2020
FDA Warns Seller of Homeopathic Medicine for Coronavirus Claims
On April 1, 2020, the FDA issued a warning letter to Homeomart Indibuy for selling products with unsupported claims that they can treat coronavirus (COVID-19).
Recalls & Warnings
July 23, 2016
Seller of GlucoCor Warned for Drug Claims
On June 30, 2016, the FDA issued a warning letter to MC-COR, LLC, following a review of the company's website and Facebook page which found statements made about its GlucoCor capsules to be drug claims.
Recalls & Warnings
March 16, 2006
Garden of Life, Maker of Primal Defense, Settles FTC Charges
On March 9, 2006, The Federal Trade Commission (FTC) announced that an operation that marketed dietary supplements sold at Whole Foods Market, GNC, the Vitamin Shoppe, and on the Internet settled FTC charges that they made deceptive advertising claims about their supplements.
Recalls & Warnings
December 21, 2012
Dangerous Supplement Being Sold Under New Name
On December 21, 2012, the FDA warned consumers that Reumofan Plus, a dietary supplement promoted for arthritis and muscle pain that has been linked to serious and sometimes fatal side effects, is now being sold under the name WOW.
Recalls & Warnings
April 23, 2013
Seller of Digestion, Thyroid and Vitamin D Supplements Warned For Drug Claims
On November 5, 2012, the FDA issued a warning letter to The Women's Health Institute at Texas following a review of the company's various websites which found statements made about Digest + SEB, Iodine Plus 2, and D5000 Vitamin D dietary supplements to be drug claims.
Recalls & Warnings
February 20, 2013
Recall: Arthritis and Muscle Pain Supplement Contains Prescription Drugs
On February 15, 2013, Reumofan Plus USA, LLC and Reumofan USA, LLC announced a recall of Reumofan Plus, a dietary supplement promoted for arthritis and muscle pain, because it was found to contain the active pharmaceutical ingredients methocarbamol, dexamethasone, and diclofenac.
Recalls & Warnings
August 22, 2012
FDA Warns of Life-Threatening Side Effects and Withdrawal Symptoms from Two Arthritis, Muscle Pain Supplements
On August 21, 2012, the FDA issued a warning to consumers about the dangers of taking Reumofan Plus and Reumofan Plus Premium, two dietary supplements marketed for arthritis, osteoporosis and muscle pain.
Recalls & Warnings
April 16, 2019
DMHA and Phenibut Are Not Permitted in Dietary Supplements, Warns FDA
On April 16, 2019, the FDA announced it has issued 11 warning letters to companies whose dietary supplement products contain the drugs DMHA or phenibut, and therefore are in violation of the law.
Recalls & Warnings
December 08, 2017
Limbrel Capsules for Osteoarthritis Linked With Potentially Life-Threatening Health Risk, FDA Warns
On December 4, 2017, the FDA urged consumers not to take Limbrel (Primus Pharmaceuticals), a capsule marketed to manage the metabolic processes associated with osteoarthritis, because it has been associated with serious adverse events, including drug-induced liver injury and a lung ...
Recalls & Warnings
July 28, 2015
Abnormal Heart Rhythms Linked with Unauthorized Natural Product, Health Canada Warns
On July 27, 2015, Health Canada (the Canadian equivalent of the U.S. FDA) announced that it has received a serious adverse reaction report of abnormal heart rhythms associated with the use of an unauthorized natural product in Canada called Remogen, which contains the drug ibogaine.
Recalls & Warnings
July 06, 2012
Centrum Multivitamins: Breast and Colon Health Claims Pulled
On July 5, 2012, Pfizer Consumer Healthcare announced it will withdraw breast and colon health claims from its Centrum multivitamin advertising and labels, and will revise health and energy claims made on other Centrum products.
Recalls & Warnings
February 29, 2008
FTC Sues Sellers of Weight-Loss Pills for False Advertising
On February 8, 2008 the The Federal Trade Commission (FTC) charged a business operation with violating federal law by falsely claiming that its weight-loss pills cause users to lose weight without dieting or exercise.
Recalls & Warnings
January 23, 2014
Many Thyroid Supplements Contain Thyroid Hormones -- Risk of Thyrotoxicosis
A recent study found that 9 out of 10 supplements marketed for "thyroid support" and purchased at retail stores or on the Internet contained actual thyroid hormones thyroxine (T4) and/or triiodothyronine (T3), posing a risk to consumers.
Recalls & Warnings
January 17, 2018
Joint and Pain Relief Product Contains Undeclared Drug
On January 17, 2018 Health Canada warned consumers that Linsen Double Caulis Plus, a supplement for joint pain, was found to contain the undeclared drug dexamethasone.
Recalls & Warnings
October 10, 2003
Government Stops Sale of Supplements Claiming to Treat Obesity and Impotence
On October 8, 2003, The Food and Drug Administration (FDA) announced that on September 22, 2003, U.S. District Court Judge Robert J. Vining, Jr.
Recalls & Warnings
January 07, 2002
Liver Toxicity with Kava
As announced in a December 19, 2001 letter to healthcare professionals, The Food and Drug Administration (FDA) is investigating whether the use of dietary supplements containing kava (also known as kava kava or Piper methysticum) is associated with liver toxicity.
Recalls & Warnings
December 18, 2006
Canada Warns of Herbal Sleep Product Containing Rx Drug
On December 18, 2006 Health Canada advised consumers not to use a product called Eden Herbal Formulations Sleep Ease Dietary Supplement, because it was found to contain an undeclared drug estazolam, which can be habit-forming when used for as little as a few months.
Recalls & Warnings
January 04, 2014
Beware of Supplements Claiming to Treat Brain Injury, FDA Warns
On December 31, 2013, the FDA warned consumers to avoid dietary supplements promoted to prevent, treat or cure concussions and other traumatic brain injuries (TBIs).
Recalls & Warnings
November 02, 2012
Maker of Joint Health, Blood Sugar, Prostate, Ginkgo Supplements and More Warned For Drug Claims, Misbranding and Adulteration
On September 10, 2012, the FDA issued a warning letter to Global Source Management & Consulting for making drug claims about the following dietary supplements: Scientific Joint Program capsules, Alpha Lipoic Acid, Healthy Blood Sugar Diabetic Support, Dr.
Recalls & Warnings
September 26, 2012
Maker of Eye Health Supplements Warned for Drug Claims
On September 18, 2012, the FDA issued a warning letter to EyeScience Labs, L.L.C. because statements made about the company's Macular Health Formula, Dry Eye Formula and Diabetic Vision Formula supplements were found to constitute drug claims.
Recalls & Warnings
September 10, 2012
Maker of Omega-3, Bone and Brain and Supplements Warned For Drug Claims
On August 27, 2012, the FDA issued a warning letter to PruTect Rx indicating that statements on the company's websites about Omega3PruTect, NeuroPruTect, VitaminD3PruTect and OsteoPruTect constitute drug claims, although the products are not approved drugs.
Recalls & Warnings
March 28, 2017
Yogurt Peanut Crunch Bars Recalled Due to E. Coli Risk
On March 23, 2017, Pro Sports Club of Bellevue, WA issued a recall of 36,957 20/20 Life Styles Yogurt Peanut Crunch bars because they have the potential to be contaminated with Escherichia coli O157:H7.
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 ...
Recalls & Warnings
March 10, 2015
Seller of Vision Supplements Warned for Manufacturing Violations, Drug Claims
On February 26, 2015, the FDA issued a warning letter to Biosyntrx, following a facility inspection which found the company's products, including BioTears Oral Gel Caps, ZoOmega-3 Concentrated Pharmaceutical-Grade Fish Oil, EpiCor A Nutrient-dense High Metabolite Immunogen, Sight C+ Mineral ...
Recalls & Warnings
December 20, 2014
Company Recalls Second Weight Loss Supplement
On December 19, 2014, Bethel Nutritional Consulting, Inc. issued a recall of one lot of weight loss supplement B-Lipo Capsules because they were found to contain Lorcaserin.
Recalls & Warnings
November 14, 2014
FDA Warns Consumers Not to Buy or Use Muscle Enhancement Supplement
On November 13, 2014, the FDA advised consumers not to buy or use the muscle enhancement supplement Mayhem (Chaotic-Labz) because it was found to contain the undeclared drugs cyproheptadine and dexamethasone. These drugs can cause serious side effects and can interact with other medications.
Recalls & Warnings
March 23, 2019
DG Health NATURALS Baby Cough Syrup Recalled
On March 20, 2019, Kingston Pharma, LLC issued a recall of all lots of DG/health NATURALS baby Cough Syrup + Mucus because it has the potential to be contaminated with Bacillus cereus/Bacillus circulans.
Recalls & Warnings
January 26, 2018
Seller of Coenzyme-A Warned For Making Drug Claims
On January 5, 2018, the FDA issued a warning letter to Coenzyme A, Inc. following a facility inspection and review of the company's website that found the company made drug claims about its product Coenzyme-A.
