Vitamin D3 is a fat soluble vitamin which has several important functions within the body. Vitamin D3 plays an essential role in the immune system, is vital for the maintenance of normal muscle function and aids in the process of cell division. Its role in facilitating the absorption and utilisation of Calcium and Phosphorous in the body and plays an important part in the formation and mineralisation of bone. This contributes to the maintenance of strong, healthy bones and teeth and supports normal blood Calcium levels. Even with a varied diet, it is difficult to get enough Vitamin D through food alone, as it is not naturally abundant in many foods. A good source of Vitamin D is sunlight on the skin, hence why it is commonly termed "The Sunshine Vitamin", however there are risks associated with exposure of the skin to direct sunlight without protection for too long. Therefore Vitamin D3 supplements are a valuable alternative. HealthAid Vitamin D3 1000iu may be of particular benefit to those who do not get enough sunlight exposure, the elderly and people with a darker skin tone. It comes in an easy to swallow soft gelatine capsule which allows maximum absorption and assimilation.