Grape seed extract

Grape seeds contain Vitamin E, flavonoids, linoleic acid, and compounds called procyanidins (also known as condensed tannins, pycnogenols, and oligomeric proanthocyanidins or OPCs) are highly concentrated in grape seeds. These healthful compounds can also be found in lower concentrations in the skin of the grape. Procyanidins are also found in grape juice and wine, but in lower concentrations. Resveratrol is another of grape's healthful compounds which are related to procyanidins and found mainly in the skins. Resveratrol has gained much popularity as an antioxidant supplement.
Standardized grape seed extract is said to be 10 times more active of an antioxidant than beta carotene, and 20 times more active than vitamin C. The only high one will experience from regular use of this is in the form of many fewer sick days, and faster recovery of the few days which occasionally happen.