Benefits of Healthvit Resveratrol : a polyphenol antioxidant found naturally in the diet. Although resveratrol is present in grape products and peanuts, the richest source of resveratrol is Reynoutria japonica, a plant used in traditional oriental medicine. Supports Heart Health. Supports Sugar Metabolism. Supports blood flow.Supports heart health by supportig blood flow and vascular function. Supports sugar metabolism.