Contains 400mg of Magnesium for whole body support (1) Helps maintain healthy bones (1) Supports muscle relaxation (1) Supports heart and nerve health (1) One rapid release liquid softgel per day Nature's Bounty High Potency Magnesium provides 100% of the daily recommended value ...Contains 400mg of Magnesium for whole body support (1) Helps maintain healthy bones (1) Supports muscle relaxation (1) Supports heart and nerve health (1) One rapid release liquid softgel per day Nature's Bounty High Potency Magnesium provides 100% of the daily recommended value for this important mineral in just one softgel. Magnesium is essential for supporting bone health, and plays an important role in maintaining bone mineralization. As a component in over 200 enzymes in the body, Magnesium is also involved in muscle contractions, nerve impulses, energy metabolism and protein formation.