... , including OPCs, Oligomeric Procyanidolic Complexes, leuco anthocyanin, anthocyanidin and still others. We will refer to them as OPCs for the ... hours after taking them! The person responsible for their discovery was a French scientist named Dr. Jacques Masquelier, who first ... double in strength only hours after eating them. His discovery was made in 1948. In 1951, this same doctor extracted ...