The Wall Street Journal takes a look at the preliminary human testing of this antioxidant-rich substance found in grapes and other plants. They report resveratrol has been found in animal studies to prevent or slow progression of illnesses from cancer to cardiovascular disease (CVD)—and even to extend the life span of some organisms.
They report, since 2008, at least five human studies have been presented showing human benefits: One 100-person placebo-controlled study found resveratrol lowered blood-glucose levels in diabetics; a 19-person study sponsored by Royal DSM, found DSM’s resveratrol ingredient, resVida, improved blood flow; a three-month study of 51 people found a resveratrol-containing supplement increased endurance on a stationary bicycle compared with a placebo, and also increased verbal memory scores on a standardized test; and researchers found five-months' therapy with a resveratrol a supplement significantly improved vision in an 80-year-old man who was having difficulty with night driving.
They note while the research is exciting, the proper dose for human consumption has not been determined and it’s too early to determine long-term effects of taking large amounts of reseveratrol.