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Resveratrol is the active ingredient in red wine that is associated with helping to prevent cardiovascular disease, cancer, and other age-related health problems; however, resveratrol has not been adequately studied, especially in humans, and so it has not been scientifically proven to work.  Not enough is known about its absorption, clearance, metabolites, or its effects on the liver.  For instance, it may have the potential to initiate estrogen-sensitive breast cancer.  Instead of taking resveratrol supplements, consume it in foods, including red wine, red grapes, purple grape juice, peanuts, and some berries. Resveratrol does not seems to play any part in weight loss.