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CL Answers (21)

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Do companies have to test supplements before they are sold?

Learn more about the requirements supplement companies are held to and FDA regulations.

Do Supplement Companies Have to Test Their Products? -- supplements in glassware in laboratory

Is it better to eat farmed salmon or wild salmon? Which one has more omega-3s and less contamination with PCBs, mercury, etc.?

Learn more about wild caught vs. farm raised salmon, including omega-3 content and contamination with PCBs, mercury, and other toxins.

Wild Caught vs. Farm Raised Salmon -- salmon on a dinner plate with fork and knife

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

Is it safe to fly and how can I avoid getting COVID when flying?

How to fly safely and avoid COVID-19. Tips to help you stay safe and protect others while flying during the COVID-19 pandemic.

Is it safe to fly and how can I avoid getting COVID-19? -- Man on Airplane With Mask and Hand sanitizer

Can I get the new coronavirus (2019-nCoV) from supplements from China?

Information about catching the coronavirus from supplements from China, plus info on contamination with heavy metals like lead and more.

Coronavirus Risk With Supplements from China? -- 'Coronavirus' written on paper surrounded by supplements capsules and tablets

What is BPC-157, what is it used for and is it safe?

Find out about BPC-157, including what it's promoted for and if it is safe.

White capsules vials and a syringe on a blue background

Should I be concerned about supplements that contain Polysorbate 80? Is it safe?

Find out if polysorbate 80 is a safe ingredient in supplements.

Is Polysorbate 80 Safe? -- woman looking at supplement label

What are the health benefits of aloe supplements? Are they safe?

Learn more about oral aloe supplements, including gels and juices.

Are some probiotics dangerous? I've heard that Bacillus subtilis, a soil-based probiotic, can cause infections.

Find out if soil-based probiotic supplements are safe to take. Information about side effects, allergic reactions, infections and more.

Are probiotics safe? -- probiotic capsules and bottle

Is magnesium citrate safe? I heard that it might cause damage to the esophagus.

Find out if magnesium citrate is safe to use or if it causes damage to the esophagus.

Magnesium citrate in a spoon over a glass of water

I take 1000 mg of a high-absorption curcumin extract. It seems to be working, but would it be safe to take a larger dose?

Is it safe to take high doses of high-absorption curcumin extract? Learn more about these larger doses. ConsumerLab.com's answer explains.

High Doses of Curcumin & Safety -- curcumin capsules

Titanium dioxide is listed as an ingredient in my supplement. Is it safe?

Titanium dioxide in supplements might have you concerned. Learn more about titanium dioxide - FDA status and evidence from studies on cancer.

Titanium Doxide Safety -- close up of broken white pills

Is fish oil safe? Is it contaminated with mercury and PCBs?

Fish oil safety, including information on contamination with mercury and PCBs.

Is Fish Oil Safe? -- fish oil capsules up close

Is it safe to take CoQ10 while taking blood thinners like warfarin or Plavix (clopidogrel)?

Learn more about the possible counteractive effects of CoQ10 and blood thinners, including safety.

CoQ10

To avoid mercury, I tried skipjack tuna instead of albacore, but I didn't like the taste. Is it safe to continue to eat albacore if just once a week?

Concerned about mercury in albacore tuna? Find out how often it is safe to consume albacore tuna, and the best canned tuna and salmon alternatives to albacore tuna that are high in omega-3s and low in contamination with mercury. ConsumerLab.com's answer explains.

Canned tuna, salmon and sardines reviewed by ConsumerLab.com

Does turmeric/curcumin help for osteoarthritis in dogs and cats? Is it safe?

Learn more about turmeric & curcumin supplements for dogs and cats to help with osteoarthritis and the safety. ConsumerLab.com's answer explains.

I would like to try gotu kola for varicose veins but I've heard it's not safe to take. Is that true?

Learn more about gotu kola, including possible benefits for varicose veins and whether it is safe to take. ConsumerLab explains.

Do "lite" salts and salt substitutes containing potassium help lower blood pressure and reduce heart risks? Are they safe?

Find out if replacing regular salt with "lite" salt or salt substitutes, such as Morton Lite Salt, Morton Salt Substitute, NoSalt Original Sodium Free Salt Alternative, and MySalt, helps to reduce blood pressure, or decrease the risk of heart attack and stroke. Plus, learn about the safety and side effects associated with salt substitutes, drug interactions, and more.

Lite Salt and Salt Substitutes with Potassium -- Salt Shaker

Is avocado oil safe to use?

Find out if avocado oil is safe to consume, if it is likely to contain persin, if you can have an allergic reaction to avocado, or if avocado interactions with medications. ConsumerLab.com's answer explains.

Avocado oil safety - bottle of avocado oil

Are the inactive ingredients I see listed on my supplement label necessary? Are they dangerous?

Learn more about the inactive ingredients found in supplements, including coloring agents, and their safety.

Is Spirulina safe? I heard that it can contain toxins, such as BMAA and microcystin toxin.

Is Spirulina safe? Find out if Spirulina contains toxins like BMAA and microcystin toxin.
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Clinical Updates (10)

Search term may appear only in full report available to members. Join now for full access.

8/03/2018

Vitamin C for Colds?

Taking vitamin C may modestly help with colds, according to a new study -- but there's a catch. Find out in the What It Does section of the Vitamin C Supplements Review. (Also see our Top Picks for vitamin C supplements.)
10/21/2012

Can Echinacea Prevent Colds?
Although the evidence behind echinacea has been mixed, a new study -- the largest to date -- found that taking a particular type of echinacea supplement throughout cold season reduced cold "events" (catching colds and days spent with colds) by 26%. See the update to the Echinacea Supplements Review for details about this particular supplement, including the special way it is taken. More >>
8/07/2021

COVID Transmission Among Vaccinated?
Can you catch COVID from someone who is vaccinated if you are vaccinated? Find out what data suggests in our article about COVID-19 Vaccines.
11/14/2017

How Much Tea Is Safe?

Green and black teas contain fluoride, which helps build teeth and bones, but excessive intake of teas can cause teeth and bones to become brittle ("fluorosis"). How many cups of tea are safe? Find out now based on recent tests of fluoride in green, black, and herbal teas in the "Concerns and Cautions" section of the Green Tea Review >>
3/31/2020

Is Quercetin Safe?
Quercetin has been proposed as a treatment for a range of medical conditions, including COVID-19, but is it safe? Find out what studies have found, including results of a recent, small clinical trial, in the Concerns and Cautions section of the Quercetin Supplements Review. Also see our Top Picks for quercetin.
8/27/2020

Is Expired Green Tea Safe?
We were asked if it is safe to use green tea past its "best by" date and if its flavor or health benefits would be diminished. See our answer in the How to Use section of our Green Tea Review. Also see our Top Picks for green tea — including tea bags, loose tea, matcha, and green tea supplements.
5/11/2021

Whitener In Many Pills May Not Be Safe
Titanium dioxide, which is commonly used to whiten pills, is not safe according to the European equivalent of the FDA. Find out why in our Review Article about Inactive Ingredients.
8/25/2015

Are Green Tea Pills Safe?
Studies have suggested that extracts of green tea can reduce the risk of certain cancers, improve memory, shrink uterine fibroids, and even help with weight reduction. However, liver toxicity has been a concern with green tea extracts. A large, government-funded study recently found that pills of green tea extract can be safe for many people, but some may experience adverse reactions, including elevated liver enzymes. Get the details in the "Concerns and Cautions" section of the Green Tea Review, along with information about what green tea does and our tests of green tea extracts, brewable teas, and beverages >>
11/15/2021

Flu & COVID Vaccines
Additional research indicates that it's safe to get flu and COVID-19 vaccines together. Get the details.
11/15/2021

Natural Toothpastes
Are "natural" toothpastes safe and effective? Find out in our updated article about Finding the Best Toothpaste.
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