Joint mobility can become a problem for the older dog and cat, leading to stiffness, immobility and in turn discomfort and pain. Vitapet Normal Strength R-A Joint Formula contains a unique blend of selected fish and vegetable oils, rich in the Omega-3 nutrients EPA (Eicosapentaenoic acid). Research has indicated that increaded levels of these nutrients may help to maintain pain-free, supple and mobile joints. The blend also contains vitamins A and D, as well as vitamin E, an important in vivo antioxidant.