Phosphorus is an element that is part of every cell in your body. It forms part of the molecule called Adenosine triphosphate (ATP) which is known in biochemistry as the "molecular currency" of intracellular energy transfer; that is, ATP is able to store and transport chemical energy within cells. Phosphorus works with calcium and other nutrients to build healthy bones and teeth. Phosphorus also helps maintain normal pH balance and supports growth.
Phosphorus, Vitamin D, calcium, and are closely related. A large excess of phosphorus may also deplete blood levels of calcium. In fact it's more common to have too much phosphorus in your body than too little. Kidney disease or eating too much phosphorus and not enough calcium can lead to an excess of phosphorus.