Because vitamin D is so important for bone health, researchers thought it might also help treat the symptoms of osteoarthritis. In fact, in the Framingham study, exercise that strengthens muscles above and below the joint, vitamin C, vitamin D, and calcium helped stop the progression of osteoarthritis. Other studies have shown vitamin D didn’t prevent further damage. That’s no reason to duck your Ds, though. D helps fight inflammation in your body, which could help osteoarthritis in the long run, in addition to helping other parts of your body. Get your daily Ds from a combination of foods like salmon, tuna, eggs, and fortified beverages like OJ, milk, etc., and supplements.