Solgar Vitamin D3 (Cholecalciferol) 1000 IU (25 g) is a premium formula delivering vitamin D in the form that is easiest to use by the body D3. Supporting optimal 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. Solgars Vitamin D3 is a highly absorbable vitamin D. 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.