Vitamin D3 is a fat soluble vitamin that plays an essential role in the immune system. It is vital for the maintenance of normal muscle function. Vitamin D helps regulate the absorption and utilisation of calcium and phosphorous in the body and plays a crucial function in bone formation and mineralisation to help the development of strong healthy bones and teeth. HealthAid Vitamin D3 comes in an easy to swallow vegeterian capsule for maximum absorption and assimilation.