Supports health of the brain, cardiovascular and immune systems, skin, and connective tissue.* Polyphenol-C® 500 combines non-GMO vitamin C (ascorbic acid) with extracts of grape, blueberry and cranberry, and concentrates of blackberry, raspberry, and strawberry. The combination supplies diverse antioxidant compounds which are found in a healthy, whole foods diet, with high quality ingredients that are lab tested for purity and potency.