As a result of extensive news coverage, sales of supplements greatly increased in 2006, despite cautions that benefits to humans are unproven. Most resveratrol supplements are oral pills intended to be swallowed. However, resveratrol lozenges are meant to be kept and consumed in the mouth to improve bioavailability.
Supplements vary in purity, and can contain anywhere from 50 percent to 99 percent resveratrol.Many brands consist of an unpurified extract of Japanese knotweed; these contain about 50 percent resveratrol by weight as well as emodin, which, while considered safe in moderate quantities, can have a laxative effect in high amounts.
Harvard University scientist, Professor David Sinclair is often attributed to quotes in many of these online ad sites. Sinclair, who discovered resveratrol, has gone on record in Business Week to say he never uttered many of the statements attributed to him on these sites.
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