Performance Calcium and Vitamin D3 is an optimised blend of ultra-premium quality Calcium, and Vitamin D3 - both essential to overall health, with proven benefits as part of your diet. Calcium is Research Proven: Calcium is needed for the maintenance of normal bones Calcium is needed for the maintenance of normal teeth Calcium contributes to normal blood clotting Calcium contributes to normal energy-yielding metabolism Calcium contributes to normal muscle function Calcium contributes to normal neurotransmission Calcium contributes to the normal function of digestive enzymes Calcium has a role in the process of cell division and specialisation Vitamin D is Research Proven: Vitamin D contributes to normal absorption/utilisation of calcium and phosphorus Vitamin D contributes to normal blood calcium levels Vitamin D contributes to normal energy-yielding metabolism Vitamin D contributes to normal functioning of the nervous system Vitamin D contributes to normal macronutrient metabolism Vitamin D contributes to normal psychological function Vitamin D contributes to the maintenance of normal hair Vitamin D contributes to the maintenance of normal mucous membranes Vitamin D contributes to the maintenance of normal skin