Resveratrol supplements have been popular since 2006, when studies in animals showed "life-extending" and "endurance-enhancing" effects, among other potential benefits. Although evidence of such effects does not exist for people, resveratrol does seem to improve glucose metabolism in certain individuals and a wide-range of resveratrol (or "red wine extract") supplements are marketed, including capsules, liquids, and tablets.
ConsumerLab.com tested many popular resveratrol supplements on the market. One supplement was discovered to contain only 2 mg of resveratrol per capsule -- that's just 1 to 2% of the amount provided by most other products. Another supplement failed to break apart properly in disintegration testing. A third resveratrol product lacked FDA-required ingredient labeling. The good news is that many other resveratrol supplements contained their claimed amounts of resveratrol (30 mg to 499.8 mg per serving) and passed other important tests -- including tests for contamination by lead and cadmium, which are toxic heavy metals.
Among the quality-approved products, ConsumerLab.com calculated the cost to obtain 100 mg of resveratrol to be as much as $3, or as little as just 6 cents -- a huge potential savings!
You must jointo get the full test results for 23 resveratrol supplements along with ConsumerLab.com recommendations and quality ratings for resveratrol. You will get results for 10 supplements selected by ConsumerLab.com and for 13 other resveratrol supplements that passed voluntary, quality certification testing, as well as information about one supplement similar to another that passed testing but which is sold under a different brand.
In this comprehensive report, you'll discover:
- Which resveratrol supplements failed testing and which passed
- Direct comparisons and quality ratings of resveratrol supplements
- How the cis- and trans- forms of resveratrol differ and how much of each are in the tested supplements
- Cost comparisons, showing you which of the best resveratrol supplements are lowest cost
- Dosage information for using resveratrol -- and what clinical studies have shown
- Side-effects, cautions, and potential drug interactions with resveratrol
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