On the contrary, a number of us are taking doses in that range. For example, the previous posting in this thread by tintinet mentions taking 5+g/day. I think that the members of this forum, which includes a number of scientists and a couple physicians, have done an impressive job of exploring the formulation and dosing of resveratrol. Joint and tendon pain is a relatively common phenomenon, so it would be pretty easy for one or two cases of that to be ignored in a 28 day study. I think that the members of this group are on to something with the recognition of this effect, and if you have followed the forum for a while you will have seen a number of hypotheses floated as to the molecular mechanisms involved. I'm not sure that studies of typically sedentary animals are the best place to look for this sort of problem.As announced 7 January 2008, the Sirtris Phase 1b clinical study in human patients with Type 2 Diabetes was conducted using a daily dosage of 2,500-5,000 mg resveratrol (proprietary formulation) per day. That's more than anyone in this thread discussed taking. No significant adverse effects were reported.
This contradicts anecdotal accounts in this forum of joint pains, etc. caused by taking high does of resveratrol. It would be interesting to discover how many of the people reporting these symptoms would have done so if they had not first read other accounts of such side effects here. Is there any scientific basis for concluding that resveratrol consumption above a certain threshold causes joint pain? Animal studies with which I'm familiar point to the exact opposite conclusion.
One lesson learned from comparing the discussions in this thread dating back almost a year to the published results in the human study is that it is very difficult for layman to judge an appropriate dosage for resveratrol consumption. And that's not surprising.
However, it is worth noting that this study was only conducted over a 28 day period.
