Vitamin D helps build strong bones by increasing the body’s absorption of calcium and phosphorus.; In supplement form, it is available as ergocalciferol (D2) or cholecalciferol (D3).; Studies indicate that D3 may be the more potent and longer-acting form preferred by the body.; Similarly, vitamin K is found in K1 and K2 forms.; K2 is of particular importance for the health of bones and system as it helps direct calcium out of the arteries and to the bones.; K2 is made up of a series of menaquinones, of which menaquinone-7 (MK-7) is most efficiently absorbed and bioavailable.; Highlights: Bone and Immune Health, 2-In-1 Formula, Dietary Supplement.