... free radical scavengers in the human body. Many names refer to this set of bioflavonoids, including OPCs, Oligomeric Procyanidolic Complexes, leuco anthocyanin ... and still others. We will refer to them as OPCs for the duration of this discussion. What Does OPC Grape Seed ... when we consume them. It was, in fact, this very ability that led to their discovery. OPC bioflavonoids were first noticed in ...