Multivitamins are natural substances that your body needs to grow, develop and function normally, when your body needs more Vitamins than usual. Multivitamins should be taken who need extra Vitamins, who cannot eat enough food to obtain the required Vitamins or who cannot receive the Vitamins from food they eat. Vitamins are key micronutrients that do not provide energy but play an important role in physiological function and energy metabolism. Minerals, such as Calcium, Iron, Potassium, Sodium and Magnesium are also micronutrients which assist in the creation of body tissues i.e. bones, maintenance of fluid balance and muscle contraction.