Herbs of Gold Resveratrol Advantage contains the herb Reynoutria japonica, which provides a rich source of the antioxidant and free radical scavenger, resveratrol. Reynoutria japonica is a rich and reliable source of resveratrol, whereas the resveratrol content of grapes and red wine varies considerably. Contains important nutrients including vitamin C, lysine, proline and glycine which are required for the synthesis of collagen, elastin and firm connective tissue.