I came across ImmInst (and then joined) while looking for suppliers of resveratrol. I was taking small amount of resveratrol. Then I read about some research and Sinclair's 2006 Nature paper and decided to take more resveratrol. Actually the clincher was Auwerx development of Olympic mice.
Now I'm taking 1.5-2 gr/day. I saw improvement in my cholesterol profile but not on glucose. As far as exercise nothing even close to an Auwerx mouse. Should I increase the dosage? But then I thought: the relevant papers have been out for almost a year. How come athletes are not taking massive amounts of resveratrol? We can be sure that if Auwerx miracle could be reproduced in humans, athletes would be swallowing the stuff (but they don't). Could be that mouse and human physiology/metabolism are quite different. While mice can more easily increase the number of mitochondria, it is much harder for us.
So the moral of the story is: Resveratrol is very effective for mice. For humans it's not that clear.