What is Vitamin D3 spray for?. - May help to promote calcium absorption. - May help to maintain adequate serum concentrations of calcium and phosphate. - May play a crucial role in the normal mineralization of bone. - May help to maintain strong and healthy bones. - Help in cell differentiation and improve specialisation of cell functions. - May help boost the immune system and inhibit the autoimmunity. - Also improve insulin secretion. - May help regulate blood pressure