Resveratrol is produced by grapes and is found in red wine – this is why red wine has been associated with health benefits. You can also take resveratrol in supplement form which has many health benefits! Shoot for 20mg/day and stay away from higher doses as they can negatively impact heart health. Resveratrol probably won’t impact training gains, but it does have implications for improved health and quality of life which are just as important.
Reference: Frémont, L. (2000). Biological effects of resveratrol. Life Sciences, 66(8), 663-673.