Herbal Supplement Non GMO Free Radical Scavenger A Dietary Supplement Vegetarian - Vegan Botanical - Herbs Family Owned Since 1968 GMP Quality Assured Hawthorn Berries have a long history or traditional use in Europe and North America as an herbal tonic. Modern scientific studies have identified a number of bioactive constituents, including OPCs (Oligomeric Procyanidins). Many of the compounds have been found to possess powerful free radical scavenging activity.