Solgar Vitamin D3 400 IU (10mcg) 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. Solgar's 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. Vitamin D contributes to: Normal function of the immune system Maintenance of normal bones and teeth Normal absorption of calcium and phosphorus Contributes to normal blood calcium levels Maintenance of normal muscle function About Solgar Since 1947, Solgar has created the finest nutritional supplements in small batches, based on tireless research and using only the finest raw materials. When it comes to quality, Solgar is The Gold Standard. With more than 300 products that bear the hallmark of the gold label, distributed in over 60 countries across the globe, Solgar is trusted by millions of consumers worldwide. They are also committed to protecting the environment and have been Carbon Neutral since 2010.