Research indicates that vitamin D plays a significant role in helping to develop bone strength and density. Vitamin D3 regulates healthy cellular growth, which has been shown to support heart health. Many are not taking the recommended daily dose of Vitamin D3, but it is needed in almost every cell of the body, responsible for calcium absorption, bone and teeth health and is vitally important for immune function. Vitamin D has the nickname the 'Sunshine Vitamin' because our skin manufactures vitamin D when exposed to sunlight.