Bioconcepts vitamin d3 5000iu super strength contains the optimum level of vitamin d3 to provide your body with this essential nutrient why your body needs vitamin d3 contributes to the normal absorption and utilisation of calcium and phosphorus contributes to the maintenance of normal bones and teeth contributes to normal blood calcium levels contributes to the maintenance of normal muscle function contributes to the normal function of the immune system plays a role in the process of cell di