nutraMetrix Isotonix OPC-3® for Adults & Children Ages 4+

What Makes nutraMetrix Isotonix OPC-3® Unique? nutraMetrix Isotonix OPC-3 is an isotonic-capable food supplement that is made from a combination of bilberry, grape seed, red wine and pine bark extracts, and citrus extract bioflavonoids, all found to be powerful antioxidants.