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Product Reviews (90)
Fish Oil and Omega-3 and -7 Supplements Review (Including Krill, Algae, Calamari, and Sea Buckthorn)
Black Currant Oil, Borage Oil, Evening Primrose Oil, Flaxseed Oil, and Hemp Oil Supplements Review: Sources of ALA and GLA (Omega-3 and -6 Fatty Acids)
CL Answers (66)
I have type 2 diabetes. Should I be concerned about ingredients like maltodextrin and maltitol that are found in some protein bars and drinks?
What is berberine? Can it really lower blood sugar? Are there any cautions? Which supplements are best?
I read on your website that some B-12 vitamins cause diarrhea due to added sugar substitutes like sorbitol. I stopped mine and my diarrhea stopped immediately. Which B-12 doesn't contain sorbitol?
I take insulin (Humalog) for diabetes. Are there supplements that could affect my blood sugar levels and how much insulin I need to take?
Do Sugar Bear Hair Vitamins make hair shine, nails stronger, and help both to grow? They taste good but are super expensive.
Do any supplements help with the coronavirus (COVID-19)? Do supplements like zinc, vitamin C, or herbals work?
What's really in supplements for "adrenal support" and "adrenal fatigue"? Do they work and are they safe?
What is shilajit? Does it have any proven health benefits, and is heavy metal contamination a concern?
I thought the B vitamins were all water soluble and did not build up in the body, so you would not build up toxic levels. Am I wrong?
I'm a middle-aged healthy woman who gets occasional urinary tract infections. I heard that cranberry juice or cranberry supplements can help prevent the condition. Is this true?
Can taking too much vitamin B-12 be dangerous? The label on my B-complex states it contains 50,000% of the Daily Value!
Is the probiotic "Milk Test," as described on many websites, really an effective way to test the quality of the bacteria in probiotic supplements at home?
Which oils can help lower my cholesterol and risk of heart attack? How are coconut oil, olive oil, and fish oil for example?
Encyclopedia Articles (10)
Recalls & Warnings (63)
Seller of "Super Strength Prostate Formula," Acai Berry Supplements & More Warned for Drug Claims
Ginkgo, Milk Thistle, Cleanse and Nopal Supplement Maker Warned For Manufacturing Violations, Drug Claims
FDA Warns Seller of "Quick Slim with pure Hoodia Gardonii" and "Diabalance Herbal Blood Sugar Balance"
Supplement Company Warned For Medical Claims and Misbranding Of Omega-3, CoQ10, Noni Juice And More
Brewable Tea and Tea Supplement Company Warned For Manufacturing Violations and Drug Claims
Seller of Sexual Enhancement, Cholesterol, Resveratrol Supplements and More Warned For Drug Claims
Maker of Joint Health, Blood Sugar, Prostate, Ginkgo Supplements and More Warned For Drug Claims, Misbranding and Adulteration
Maker of Noni, Nopal, Blood Sugar and Cholesterol Supplements Warned For Drug Claims, Misbranding, and Manufacturing Violations
Synthetic Amphetamine, Less Protein and More Sugar Than Claimed Found in Workout Supplements
FDA Warns Seller of Arthritis, Blood Pressure, Diabetes Supplements For Making Drug Claims
Manufacturer of Green Tea, Vitamin E, Omega-3 and Cranberry Supplements Warned For Manufacturing Violations, Misbranding and Drug Claims
Maker of Omega-3, Saw Palmetto, St. John’s Wort Supplements And More Warned For Manufacturing Violations and Drug Claims
Seller of Aloe, Thyroid and Other Supplements Warned for Manufacturing Violations and Drug Claims
FDA Warns of Life-Threatening Side Effects and Withdrawal Symptoms from Two Arthritis, Muscle Pain Supplements
Maker of Blood Pressure, Probiotic, Resveratrol and Hormonal Supplements Warned For Manufacturing Violations and Drug Claims
Seller of Sexual Enhancement Supplement and Tea Drink Warned for Drug Ingredients and Drug Claims
Seller of Sexual, Muscle Enhancement Supplements Warned for Manufacturing Violations and Drug Claims
FDA Warns Seller of Milk Thistle, Chromium, Joint Supplements & More for Manufacturing Violations
FDA Warns Seller of DHEA, Creatine, Chromium & More for Manufacturing Violations, Drug Claims
Joint Pain Supplements Found to Contain Diuretics, Antihistamines and Other Undeclared Drugs
Maker of Magnesium, Calcium, Zinc, B Vitamins and More Warned for Manufacturing Violations, Drug Claims
Maker of Red Yeast Rice, St. John's Wort, Valerian and More Warned for Manufacturing Violations, Drug Claims
Manufacturer of Heart, Multivitamin, Cranberry, and Longevity Supplements Warned For Adulteration and Drug Claims
Manufacturer of Joint, Weight Loss, Muscle Supplements and More Warned for Adulteration, Misbranding and Drug Claims
Clinical Updates (42)
Ginseng for Lower Blood Sugar
A new study found that a certain kind of ginseng helps lower blood sugar levels in people with impaired fasting glucose. For more about this study and related studies on blood sugar and diabetes with other types of ginseng (which have had mixed results), see the Ginseng Supplements Review >>
Cinnamon to Lower Blood Sugar?
A study in people with elevated blood sugar levels found that a particular cinnamon extract (which CL has tested) modestly lowered blood sugar levels. The way the data was analyzed, however, appears flawed in our opinion. Get the details in the "What It Does" section of Cinnamon Supplements and Spices Review >>
Glucosamine and Blood Sugar
Glucosamine (used to treat osteoarthritis) is a type of sugar, so does its daily use affect blood sugar levels and one's risk of developing diabetes? Find out in the Concerns and Cautions section of the Joint Health Review. Also see our Top Picks for Glucosamine, Chondroitin, MSM, and Boswellia supplements.
Curcumin May Help Prevent Diabetes
Past research has suggested a potential role for curcumin (from turmeric) in blood sugar control. A recently published placebo-controlled study of curcumin given daily to people with prediabetes (those with blood sugar levels somewhat higher than normal) produced dramatic results in reducing the percentage of such individuals progressing to diabetes. Get the details in the latest update to ConsumerLab.com’s Turmeric and Curcumin Supplements Review -- which includes quality ratings of products and other potential uses of curcumin. More >>
Stevia vs. Sugar for Hunger Suppression
How does the non-caloric sweetener stevia compare to sugar in suppressing hunger before a meal? Find out in our updated answer to the question: What are the health benefits of stevia? Is it safe?
Zinc for Lowering Blood Sugar and Cholesterol?
Green Tea and Blood Sugar
Can drinking green tea reduce the rise in blood sugar after a meal, and if so, is the effect greater in the morning or evening? See what a new study found in the What It Does section of the Green Tea Review. Also see our tests and Top Picks among green tea supplements, and brewable and bottled teas.
Vitamin D & Blood Sugar Control
Maintaining moderate levels of vitamin D may aid blood sugar control, but, according to a recently published study, high-dose vitamin D supplementation may not help. For details, see the Diabetes, insulin resistance and glucose control section of the Vitamin D Supplements Review. Also see our Top Picks for vitamin D.
Study Suggests Vitamin D Level for Blood Sugar Control
A certain minimum level of vitamin D in the blood is associated with normal control of blood sugar, according to a recently published study. The study focused on women who were overweight or obese but not diabetic. The vitamin D level is consistent with the range suggested by many other studies. For more details, as well as our tests of vitamin D supplements, see the updated Vitamin D Supplements Review >>
Curcumin for Blood Sugar Control?
Preliminary research suggests that curcumin (from turmeric) taken with meals can reduce the increases in blood sugar and insulin levels that occur after eating. But does curcumin help people with pre-existing type 2 diabetes? See what a recent study found in the What It Does section of the Turmeric and Curcumin Supplements & Spices Review. Also see our Top Picks among turmeric and curcumin products.
Best Oats for Controlling Blood Sugar?
How Do "Overnight Oats" Affect Blood Sugar?
Apple Cider Vinegar for Type 2 Diabetes?
Studies have shown that taking apple cider vinegar with or before a meal can reduce the subsequent rise in blood sugar. But does apple cider vinegar improve insulin sensitivity in people with type 2 diabetes? Find out what a recent study showed in the Blood Sugar Control section of the Apple Cider Vinegar Review. Also see our Top Picks for apple cider vinegar.
Olive Oil Helps in Pre-Diabetes
Adding extra virgin olive oil to a meal decreased the rise in blood sugar and increased insulin levels after the meal, according to a new study in people with pre-diabetes. Similar benefits with olive oil have been shown in people with type 1 and type 2 diabetes. For details, see the "Insulin Control and Blood Sugar" section of the Extra Virgin Olive Oils Review, which includes our tests and comparisons of popular olive oils on the market.
Vitamin D, Blood Sugar & Insulin Resistance
Vitamin D, Blood Sugar & Insulin Resistance --A moderate, daily dose of vitamin D had positive effects on blood glucose and insulin sensitivity in healthy men and women who largely were deficient in vitamin D, according to a new study. Get the details in the Vitamin D Supplements Review >>
Resveratrol for Blood Sugar?
Despite preliminary studies which found resveratrol to help lower blood sugar in people with type 2 diabetes, a larger long-term study found no benefit. Find out more in the "What It Does" section of the Resveratrol Supplements Review >>
Whey Protein for Blood Sugar Control?
Drinking a whey protein shake before a meal improves blood sugar and insulin response in men and women with type 2 diabetes, according to a new, preliminary study. Get more details, plus our tests of protein supplements, in the updated Protein Powders and Drinks Review >>
Ubiquinol for Blood Sugar Control?
Niagen for Blood Sugar Control?
Vitamin D and Blood Sugar Control
A recent study adds to the growing evidence that obtaining and maintaining adequate vitamin D levels can help with blood sugar control. For details about this and studies regarding vitamin D and diabetes, see the Diabetes, insulin resistance and glucose control section of the Vitamin D Supplements Review. (Also see our Top Picks for vitamin D supplements.)
Curcumin for Blood Sugar Control
Is Taking Vinegar Helpful?
Vitamin C for Blood Sugar Control
Can Resveratrol Help Control Blood Sugar?
A new clinical study suggests potential benefits for people with type 2 diabetes taking one of the resveratrol products evaluated by ConsumerLab.com. Get the details in the latest update to ConsumerLab.com’s Resveratrol Supplements Review. More >>
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 >>
Pomegranate for Memory?
Pomegranate juice and supplements have been promoted for improving cardiovascular health, controlling blood sugar, and inhibiting prostate cancer. Most recently pomegranate juice was tested in a year-long study for its effects on memory. Find out if it helped, and see if it works for other touted uses, in the What It Does section of the Pomegranate Juice and Supplements Review Article.
Berberine vs. Colon Cancer?
"Whole Grain" Is Not Enough
Extra Virgin Olive Oil and Diabetes
Several studies have looked at the effects of consuming extra virgin olive oil on improving blood sugar control. The most recent study looked at whether it could delay the need for glucose-lowering medication in people with type 2 diabetes. Get the results in the What It Does section of the Extra Virgin Olive Oils Review. Also see our Top Picks among products.
Cinnamon for Arthritis
Taking cinnamon as a supplement was found to decrease symptoms of rheumatoid arthritis in a recent study. Get the details and learn what else cinnamon can do (particularly regarding blood sugar) in the What It Does section of the Cinnamon Supplements & Spices Review. (Also see our test results for popular cinnamon supplements).
Magnesium & Metabolic Syndrome
Does Tart Cherry Juice Help?
A recent clinical trial investigated the effects of Montmorency tart cherry juice on blood sugar control, markers of inflammation, and the gut. Find out if it helped. See our updated answer to the question: What are the benefits of tart cherry juice?
Is Protein Best Before or After a Meal?
Cinnamon for Prediabetes?
Apple Cider Vinegar & Diabetes
Dark Chocolate & Appetite
A recent study found that women consumed fewer calories after eating dark chocolate than after eating milk or white chocolate. Dark chocolate also resulted in better blood sugar control – an effect noted in other studies of moderate consumption of dark chocolate. Get the details on this and other effects of dark chocolate in the "What It Does" section of the Cocoa and Dark Chocolate Review, which includes our tests and comparisons of popular products.
Fat Fish vs. Lean Fish
Ginseng Role in Diabetes
Results of a recent study suggest that a form of ginseng can help control blood sugar in people with type 2 diabetes. Get the details in the What It Does section of the Ginseng Supplements Review.
Cocoa for Diabetes?
Vitamin D & Calcium for Diabetes Due to Pregnancy
A new study found supplementation with a combination of vitamin D and calcium improved fasting blood sugar levels, serum insulin levels, and insulin sensitivity in women with gestational (pregnancy-related) diabetes. For more details, including dosage, as well as our tests and comparisons of vitamin D and calcium supplements, see the update to the Vitamin D Supplements Review (Including Calcium, Vitamin K, Magnesium) >>
Cocoa Lowers Blood Sugar
In addition to potential cardiovascular, memory, and other benefits, a new analysis shows that cocoa flavanols may reduce fasting glucose and improve insulin resistance. Get the details in the "What It Does" section of the Cocoa and Dark Chocolate Review >>
Some Concern About Theobromine in Dark Chocolate
ConsumerLab’s tests of dark chocolates show them to contain about as much theobromine (a caffeine-related stimulant) as heart-healthy flavanols. So is all this theobromine good or bad? A recent study suggests that it may be an issue for people who need to control their blood sugar, while, on the positive side, it lowers LDL “bad” cholesterol. Get the details in the "Concerns and Cautions" section of the Cocoa Powders, Dark Chocolate, Extracts, Nibs, & Supplements Review, which includes comparisons of the amounts of theobromine in popular products, as well as amounts of flavanols, caffeine, and contaminants.