Resveratrol is a potent phytoestrogen and its purported "longevity" action through SIRT-1 is antagonized by niacinamide. This study actually did blood testing and lasted for 11 years, so I am inclined to give it more weight. If one even needs a study to debunk the "benefits" of a phytoestrogen that has almost the exact activity as estradiol...
http://www.latimes.com/science/sciencen ... story.html
http://www.latimes.com/science/sciencen ... story.html