What Is OPC?
Fresh fruit on a table with vitamin supplements.Image Credit: lola1960/iStock/Getty Images Isotonix OPC-3 is a dietary supplement marketed by Market America and made using a combination of bilberry, grape seed, red wine and pine bark extracts, along with citrus extract flavonoids. These extracts contain antioxidant compounds called oligomeric proanthocyanidins, or OPCs. The OPCs in OPC-3 are