Burgerstein Vitamin D3 2.000 I.E. - 60 capsulesVitamin D contributes to the absorption of calcium and the normal functioning of the immune system. It also supports the maintenance of normal bones and normal muscle function in adults. In children, vitamin D is needed for healthy growth and bone development. Vitamin D is the only vitamin where the biologically active form is a hormone. The name "vitamin D" denotes a group of related compounds. Vitamin D3, also called cholecalciferol, is the form of