Calcium is not only necessary for maintaining healthy structure of bones, teeth and hair, but it also regulates many other vital processes in the body – blood clotting, improves sleep quality by maintaining normal nerve impulse transmission, regulates the activity of digestive enzymes. This trace element regulates the activity of fibroblasts in the skin and ensures formation of collagen and elastin, which is very important in order to maintain hydrated and firm skin. When skin dries out and loses its firmness, hair become thin and start to break, nails start to peel. This indicates the deficiency.