Avicenna D3 & K2 Vitamin Supplement; Vitamin D3 is an active form of vitamin D, which plays a role in maintaining bodily functions. Vitamin K2, also known as menaquinone, belongs to the vitamin K group of fat-soluble vitamins. Using D3 and K2 vitamins together maximizes the benefits of both vitamins. Vitamin D: • Vitamin D contributes to the normal absorption/utilization of calcium and phosphorus. • Vitamin D contributes to normal blood calcium levels. • Vitamin D contributes to the maintenance of normal bones. • Vitamin D contributes to the maintenance of normal muscle function. • Vitamin D contributes to the maintenance of normal teeth. • Vitamin D contributes to the normal function of the immune system. • Vitamin D plays a role in cell division. Vitamin K: • Vitamin K contributes to normal blood clotting. • Vitamin K contributes to the maintenance of normal bones.