Reference.com describes resveratrol as a nutritional supplement derived from the Japanese knotweed that has many possible health benefits. Resveratrol is found in red grapes and red wine; one inconclusive study found that resveratrol supplements taken in high amounts may have similar results to the health benefits of red wine.
Reference.com cites studies involving resveratrol increasing the life spans of fish and mice. Other studies based on test results from mice hypothesize that resveratrol can protect bodies against radiation and stop the development of colon cancer. More studies show that mice that are fed resveratrol have a longer athletic endurance than others, but human studies have not been conducted.