DOPPELHERZ Magnesium 500+D3+K2 Depot Tablets Increasing physical demands in both work and sports, the natural aging process, and specific dietary habits can lead to increased strain on muscles and nerves. This can result in an increased need for magnesium. Magnesium is an essential mineral that the body cannot produce on its own and can only store to a limited extent. Magnesium plays a crucial role in maintaining normal muscle function and supports the proper functioning of the nervous system.