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Astaxanthin Supplements Review
See Which Astaxanthin Products Passed or Failed CL's Tests
Vitamin D Supplements Review (Including Calcium, Magnesium, Boron, and Vitamin K)
Find the Best Vitamin D Supplement with the Right Dose
B Vitamin Supplements Review (B Complexes, B6, B12, Biotin, Folate, Niacin, Riboflavin & More)
See Which B Vitamins Are ConsumerLab's Top Picks!
Melatonin Supplements Review
Find the Best Melatonin Supplements. Trouble Sleeping? See CL's Tests of Melatonin Supplements and Top Picks.
Milk Thistle Supplements Review
Find the Best Milk Thistle Supplement. Tests and Reviews of Popular Milk Thistle Supplements & CL's Top Picks.
Saffron Supplements Review
See How Saffron Supplements Compare and What They Do
L-Theanine Supplements Review
Touted for Stress Relief, Do L-Theanine Supplements Work?
Ginkgo (Ginkgo Biloba) Supplements Review
Choose the Best Ginkgo Biloba Supplement. Finding Real Ginkgo Isn't Easy — 60% Fail ConsumerLab's Tests of Quality.
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.
Does Alpha Brain really improve memory, focus and cognition?
Find out if Alpha Brain really improves memory, focus and cognition. See the clinical evidence and get details about Alpha Brain ingredients, as well as potential side effects and drug interactions. ConsumerLab.com's answer explains.
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.
I take levothyroxine (Synthroid), a thyroid hormone to treat hypothyroidism. Are there supplements or foods I should avoid, or be taking, due to this drug?
Is taking certain supplements and hypothyroidism medications bad? Learn which supplements can interact with thyroid hormone medications like levothyroxine (Synthroid), thyroid hormone levels, and laboratory tests.
Does Bacopa extract improve memory, mood, or sleep? Is it safe?
Find out if bacopa improves memory and cognition, mood or sleep, and whether it's been shown to be helpful in people with Alzheimer's disease or dementia. Plus, learn about the safety and common side effects of bacopa.
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.
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.
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.
Nattokinase Supplements Review
Choose the Best Nattokinase Supplement. CL Tests Reveal Which Nattokinase Suppplements Provide the Best Quality & Value.
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.
St. John's Wort Supplements Review
Find the Best St. John's Wort Supplement. Only 40% of St. John's Wort Supplements Pass Tests & Strength Varies Widely.
Are supplements such as Thyroid Care Plus helpful for hypothyroidism? Can supplements worsen thyroid function? And what is nascent iodine?
Learn about supplement ingredients such as iodine, selenium, zinc, acetyl-l-carnitine, ashwagandha and guggul used for thyroid conditions and find out if they are beneficial. Also learn why ingredients such as alpha-lipoic acid, soy, resveratrol, quercetin may impair thyroid function.
ConsumerLab Tests Vitamin D Supplements and Cautions About Dose
White Plains, New York, May 12, 2022 — Getting sufficient vitamin D is essential for healthy bones and has a wide range of other health benefits. It's no wonder that it has been the #1 supplement in popularity year-after-year in ConsumerLab's survey of supplement users.
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.
Recalls & Warnings
Higenamine -- A Potentially Dangerous Stimulant -- Found in Some Supplements
A recent study found concerningly high doses of the stimulant higenamine in some weight loss, energy and sports supplements sold in the U.S. Higenamine is a naturally-occurring stimulant which is permitted to be sold as a dietary supplement ingredient in the U.S.