I live in London http://4tube.in.net/ 4tube But another study out of the Washington University School of Medicine in St. Louis, for instance, found that resveratrol, the magic ingredient in red wine thought to improve insulin sensitivity and reduce the risk of heart disease, had little effect in already healthy women. Though small, the study of 29 postmenopausal women found little health improvement in those who were given 75 mg of resveratrol daily -- a large amount equal to drinking 8 liters of red wine.