Vitamin D3 helps the body in absorbing calcium | facilitating immune functions and keeping your bones strong. It also helps to facilitate the life cycle of cells | supporting the proteins that modulate cell proliferation | differentiation and apoptosis. B12 | as Methylcobalamin | supports good neurofunction | DNA synthesis and red cell production. It is involved in homocysteine metabolism | which is important for heart health | and plays an essential role in cellular metabolism.