The formula for OPC-3 Chews includes some of the most powerful bioflavonoids currently known to research scientists. These bioflavonoids are scientifically termed oligomeric proanthocyanidins, commonly abbreviated OPCs. Studies have shown OPCs to be up to 20 times more powerful than vitamin C and 50 times more powerful than vitamin E in neutralizing free radicals. The best-researched OPCs are from grape seed, red wine, grape skin, bilberries, citrus fruit and Pycnogenol®†. The combination of these powerful OPCs is unique to OPC-3.*OPC-3 Chews provide you with all the benefits of Isotonix OPC-3 ® in a delicious and convenient soft chew alternative, using natural flavors, colors and sweeteners. OPC-3 Chews are designed to deliver strong antioxidant defense, as well as a variety of other health benefits, including cardiovascular and immune support, maintenance of joint flexibility and much more.*† Pycnogenol® is the registered trademark of Horphag Research, Ltd., and is protected by U.S. Patents #5,720,956, #6,372,266 and pending applications and international patents.