WHAT IS GRAPE SEED EXTRACT? Grape Seed Extract is a bioflavanoid; flavanoids are often termed as’ Vitamin P’. BULK POWDERS™ Grape Seed Extract contains a minimum 95% OPC – OPC refers to Oligomeric Proanthocyanidins which are the active part of the grape. OPC can be found naturally in the diet, but only in small amounts. Not surprisingly, Grape Seed Ex…[1000]