Vitamin D regulates the absorption of calcium and phosphorus, facilitates a normal immune system, promotes cardiovascular health, and supports weight loss.  It also regulates insulin levels which supports diabetes prevention and management. Getting enough vitamin D is important for teeth and bones, preventing osteoporosis and osteomalacia, as well as improved resistance to certain diseases.  It helps reduce risk of multiple sclerosis, lowers the risk of  heart disease and diabetes, and helps to improve immunity to the flu.  Research has shown that vitamin D might also play a significant role in fighting depression.