Natural Factors ResveratrolRich, a super-antioxidant polyphenol formula, has a high concentration of all-natural trans resveratrol. Derived from top-grade, highly purified Japanese knotweed and red grape skins from Canada's most abundant fruit-growing region in British Columbia, ResveratrolRich promotes healthy aging and over all good health. The purity of ResveratrolRich makes this formula suitable for anyone, even those with sensitive stomachs.