Vitamin D Plus KItem Description Vitamin D and K are structurally similar fat soluble vitamins. Synergistically, they support healthy calcium metabolism and bone mineralization throughout the body as well as a healthy calcium balance in vascular tissues.* Recent studies have shown that vitamins D and K support healthy functioning of both innate and adaptive immune response.* Klaires Vitamin D Plus K is a bioavailable combination of 5,000 IU of Vitamin D3