The Vitamin D3 (Cholecalciferol) 4000 IU (100 mcg) Vegetable Capsules is a premium formula delivering vitamin D in the form that is easiest to use by the body - D3. Supporting your wellbeing, the benefits of the \"sunshine vitamin\" are numerous and well documented, but particularly for immune health. Vitamin D is a fat-soluble vitamin that is required to promote calcium absorption, which helps to maintain healthy bones and teeth. Solgar\'s Vitamin D3 is one of the highest strength Vitamin Ds available. Vitamin D3 is the more potent form of Vitamin D compared to Vitamin D2. Obtained from the sunlight or vitamin D rich foods - over a billion people worldwide have very low levels of vitamin D. In addition to changing your diet and lifestyle, taking a vitamin D supplement is a good way to top up, especially in winter months.