Nature's Sunshine Calcium Magnesium Complex is a supplement to assist with the prevention and treatment of calcium deficiencies. Combining calcium and vitamin D3 with the minerals magnesium, phosphorus, manganese, zinc and copper to help support strong healthy bones. Calcium may assist in the prevention of osteoporosis and is essential for healthy development and maintenance of the skeletal system . D3 helps maintain healthy bone mass by facilitating the dietary absorption and utilisation of calcium.