Nutrilite Cal Mag D Plus combines 5 essential nutrients, calcium, vitamin D, magnesium, zinc and manganese. It includes calcium from algal source found in the deep waters off the coast of Iceland, which is one of nature’s most concentrated botanical sources of calcium. Vitamin D is critical for calcium absorption from gut to bloodstream in your body. Magnesium contributes to the maintenance of normal bones and zinc supports healthy immune system. Manganese for normal formation of connective tissue.