Puritan's Pride, Magnesium, 500 mg, 250 TabletsProduct Description Magnesium is a crucial element in your body that helps keep your body functioning optimally. A major mineral that's found in your bones and muscles, it plays a role in more than 300 biochemical reactions, including muscle and nerve function, and glucose metabolism.* As we get older, we may become more mindful about keeping our bones strong and healthy. Magnesium plays a role in optimal bone support.* At least half of the magnesium