The product contains calcium in perfectly absorbable citrate form and vitamin D3 obtained naturally from lanolin. Calcium is needed to maintain healthy bones and teeth, helps muscles function properly, contributes to proper blood clotting, and helps maintain proper neurotransmission. It also participates in the process of cell division and specialization, helps the proper functioning of digestive enzymes and contributes to maintaining adequate energy metabolism. Vitamin D helps with the proper absorption and use of calcium and phosphorus, maintaining healthy bones and teeth, maintaining the proper functioning of the immune system, proper muscle function, and maintaining adequate levels of calcium in the blood.