OPC-85 is a potent natural antioxidant derived from the bark of the European coastal pine, Pinus maritima. OPC refers to oligomeric proanthocyanidin complexes. In vitro studies have shown that these water-soluble bioflavonoids help maintain the integrity of collagen and elastin, two important constituents of connective tissue. Recommend : 1 to 4 tablets daily. Cautions : If you are pregnant or breastfeeding, consult your health care professional before using this product. Ingredients : Pine Bark Extract (OPC-85 ) 50 mg Standardized to 85% Proanthocyanidin, Bioflavanols Serving Size : 1 tablet Additional Ingredients : microcrystalline cellulose, dibasic calcium phosphate, stearic acid, magnesium stearate and colloidal silicon dioxide.