I read what I thought was a reputable review of a weight loss 'cocktail' that included resveratrol, soy isoflavones, and quercetin developed at the U. of GA. Tried it for a while as all the supplements had other health benefits so at worst it wasn't going to harm me. It had zero effect on my weight or desire for weight loss, even though I was also eating low calorie and exercising as I had been for a while before trying the supplements.
Resveratrol may be good for other things, but not as a weight loss supplement (which is what I was using it for).