Vitamin D3 Strong is a food supplement that contributes to the functioning of the immune system. Vitamin D contributes to the normal absorption and utilization of calcium and phosphorus, to the maintenance of normal levels of calcium in the blood, to the maintenance of bones in normal conditions, to the normal functioning of muscles, to the maintenance of teeth in normal conditions. , to the normal functioning of the immune system and the cell division process. Zinc contributes to the normal metabolism of macronutrients, the normal functioning of the immune system and the protection of cells against oxidative damage. How to use Take 1 tablet a day, preferably before breakfast.