Vitamin D is vital for many functions in the human body, and influences a host of biological functions vital to health and well being. Many people develop a Vitamin D deficiency due to lack of sun exposure, and inadequate intake from food sources for various reasons. Vitamin D is most well known for its contribution to supporting bone health and immune health, and acts to assist the body absorb calcium. Vitamin K is important for a variety of metabolic roles in the body, including regulating the function of proteins involved in important coagulation processes as well as bone formation. Vitamin K 2 assists the body in transporting calcium, assuring that calcium is deposited in bones.