Support your nerve, muscle, and heart health with 21st Century® Magnesium. Each tablet provides 400 mg of Magnesium (as Magnesium Oxide), delivering 95% of the recommended daily value. Magnesium is a vital mineral that plays a key role in bone mineralization, protein formation, and the conversion of food into energy. It is also essential for proper muscle contraction and nerve impulses, making it a popular choice for those experiencing muscle cramps or looking to support a calm nervous system. These tablets are formulated for high potency and are laboratory tested for quality.