[/caption] OPC’s are derived commercially from grape seeds and the bark of pine trees.  They are a mixture of antioxidant molecules, variously called proanthocyanidins, procyanidins, proanthocyanidolic oligomers (PCO) or Oligomeric Procyanthocyanidins (OPC). OPC, as it’s commonly called in scientific circles, is expert at treating vascular diseases because it actually increases the structural [...]