* Grape Seed Extract 100:1 * A Highly Potent Phyto-Antioxidant * Dietary Supplement Jarrow FORMULAS® OPCs + 95 contains 95% polyphenols from grape seeds (Vitis vinifera), a highly potent phyto-antioxidant. Procyanidins are formed by condensation (polymerization) of flavans (also called catechins) into dimers and oligomers.