Most people have only started to hear about resveratrol through research done on red wine. Resveratrol is found in the highest concentrations if certain varieties of grapes, and red wine is the most abundant natural source. However, there have been concerns over the amount contained in red wine, and if it was enough to get an optimal resveratrol dosage.
The verdict seems to be that the amount of resveratrol found here is nowhere near enough to get the maximum benefits. When you really think about it, it makes sense. People have been drinking wine for hundreds of years, and it is only since resveratrol supplements have been available that people are starting to see significant results. Getting it from any healthy source is better than not at all, and there are other components of wine that also make it good for you. However, if you want to see the effects resveratrol can have you will most likely need to take at least 100x the amount found in a bottle of red wine on a daily basis.