Solgar Vitamin D3 1000iu 25µg 100 Softgels Gluten Dairy Sugar Salt Starch Free. Solgar ® Vitamin D3 (Cholecalciferol) 1000 IU (25 µ) 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. It keeps bones and teeth healthy, helps muscle function, supports immunity, and aids calcium absorption. 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 high strength, highly absorbable.