Vitamin D3The key to bone health, immune system support and calcium absorption. Enhancing the health of bones and teeth Increasing the absorption of calcium and phosphorus Improving immune system function Reducing the risk of heart disease and high blood pressure Prevention of rickets and osteoporosis Regulating mood and reducing depression Supporting muscle health Reducing the risk of type 2 diabetes Prevention of certain types of cancer Improving skin health (such as acne and psoriasis) Boosting energy and reducing fatigue Supporting fetal growth and health during pregnancy