Natures Aid Vitamin D3 25mcg 90. Natures Aid Vitamin D3 contributes to the maintenance of normal bones, teeth, muscle function and the immune system.. Benefits & Features. Vitamin D contributes to normal -. absorption/utilisation of calcium and phosphorus. blood calcium levels. Vitamin D contributes to the maintenance of normal. bones. muscle function. teeth. Vitamin D contributes to the normal function of the immune system. Vitamin D has a role in the process of cell division. Suitable for vegetarians. Dosage. Take 1 tablet per day with food.. Do not exceed the recommended intake.