Vitamin D is an essential, fat-soluble vitamin and very often presented like sunshine vitamin. Vitamin D contributes to normal absorption/utilisation of calcium and phosphorus, normal function of the immune system and to the maintenance of normal bones, teeth and muscle function.

Calcium contribures to normal blood clotting, to normal energy-yielding metabolism, to normal muscle function, to the normal function of digestive enzymes and is needed for the maintenance of normal bones and for the maintenance of normal teeth.