That's pretty much the current thinking -- more studies are needed, there's a paucity of decent evidence. Interestingly, there's no good reason to think resveratrol is the thing in red wine that may be helpful in reducing heart disease. A study out of Toronto some years ago showed that both a glass of white wine or a glass of beer a day had the same helpful effect, probably because low doses of alcohol can shift the cholesterol balance a bit from VLDL towards HDL. If life seems short and you want to take resveratrol, then take it. I haven't heard any suggestion that there's harm in it.