NOW Foods Grape Seed Extract 60 mg delivers a standardized extract of Vitis vinifera seeds — one of the richest natural sources of proanthocyanidins (OPCs), a class of flavonoid antioxidants with exceptional free radical scavenging capacity and multiple cardiovascular and connective tissue benefits. OPCs from grape seed have approximately 20 times the antioxidant potency of vitamin C and 50 times that of vitamin E in certain assays. Research supports grape seed extract for blood vessel integrity, reduced blood pressure, improved microcirculation, skin elasticity, and anti-inflammatory activity. OPCs also cross-link with collagen fibers, helping to strengthen capillary walls and connective tissue. NOW Foods provides a standardized extract minimum 90% OPC content per capsule, manufactured in their GMP-certified facility with identity and potency verification.