Resveratrol is a super powerful antioxidant and polyphenol found in the skin of red wine grapes that has been shown to reduce/slow certain aspects of aging, specifically cardiovascular aging.
Then eat the grapes and skip the middle man.
[EDIT: Both we and the grapes have evolved together for a very long time to be mutually beneficial. Do we really need a "product" to replace the grapes? Do we really need 10,000 grapes worth of nutrients? Can we really "hack" nature without consequences? Just asking.]