Natures Aid Vitamin D3 4000iu is a super strength vitamin D supplement that supports the maintenance of normal bones, teeth and muscles. Also supports the normal absorption and utilisation of calcium. Vitamin D can be made by your body when your skin is exposed to sunlight, which is why vitamin D is often referred to as \'The Sunshine Vitamin\'. However, despite the fact that our bodies can make this valuable nutrient, it is thought that Vitamin D deficiency is one of the most common deficiencies in the world. Key Features of Natures Aid Vitamin D3 4000iu (100ug) Super Strength Vitamin D supports the maintenance of normal bones, teeth and muscle Supports the normal absorption and utilisation of calcium Each tablet pr s 100ug (4000iu) of Vitamin DSupports a healthy immune system Contributes to normal muscle function