By Dr. Mercola. Resveratrol, a potent antioxidant found in a number of plants, including red grape skins, pomegranate, raw cacao, peanuts, and berries like raspberries and mulberries, is known to have a number of beneficial health effects.y Dr. Mercola. Resveratrol, a potent antioxidant found in a number of plants, including red grape skins, pomegranate, raw cacao, peanuts, and berries like raspberries and mulberries, is known to have a number of beneficial health effects.