Nature's Goodness Bioactivated Resveratrol Red Grape Antioxidant 500mg Capsules important component is good for nutrition and a healthy diet. Antioxidants help reduce the effects of oxidative stress and free radicals. Red grape skin is rich in polyphenol antioxidants, including anthocyanins (which give red grapes their colour) and Resveratrol, a potent antioxidant.