The benefits of vitamin D: Supports maintenance of normal bones & teeth Normal function of the immune system Supports normal blood calcium levels Contributes to normal muscle function Vitamin D3 is a fat-soluble vitamin that our body obtains primarily from direct sunlight, and in a smaller amount from certain foods. Our need for the sun vitamin grows especially during the winter season. Only the active form of vitamin D is used in the liposomal formulation of ActiNovo. We use the MK-7 all-trans form of vitamin K2, which is the highest quality available. Vitamin D deficiency is one of the most common vitamin deficiencies in the world, especially for people living in the northern hemisphere. To prevent deficiency, humans need sunshine. Therefore, the year-round intake of vitamin D supplements is recommended to maintain the body's vitamin D stores!