Vitamin D3 is a fat soluble Vitamin that is synthesised in the human body on exposure to sunlight. It plays a vital role in numerous functions of the body .Vitamin D3 is essential for the maintenance of healthy bones and teeth, the absorption of calcium and phosphorus, muscle function and the process of cell division. Vitamin D3 is also beneficial for the enhancement of the hormonal cycle, skin health, mood and cognitive performance. HealthAid Vitamin D3 5,000iu vegetarian capsules provides a highly bioavailable strength of Vitamin D3 (Cholecalciferol) that is the biological precursor of Vitamin D and is known to be more bioactive than Vitamin D2 (Ergocalciferol).