What is vitamin D? Vitamin D is a fat-soluble vitamin with wide-ranging functions. The body produces some vitamin D on its own, but it may also be obtained from foods such as fish, eggs, fortified milk and other fortified food products. Vitamin D3 (cholecalciferol) is considered a superior form of vitamin D, identical to the type naturally manufactured by the body. Vitacost brand Vitamin D3 is a high-quality supplement featuring this preferred form, with one capsule supplying 1,000% of the Daily Value for vitamin D. Why choose Vitacost Vitamin D3?High-potency supplement supplies 4,000 IU of vitamin D3 per single capsuleFeatures the preferred form of vitamin Dcholecalciferolthe same type naturally manufactured by the body when skin is exposed to sunlightEasy way to increase intake of vitamin D, which is present in a limited number of food sourcesSame quality, better value than similar products on the market!About VitacostVitacost nutritional products are manufactured to high standards of quality, efficacy and safety. Each Vitacost product meets or exceeds the standards and requirements set forth in the FDAs Code of Federal Regulation (21 CFR, 111) Current Good Manufacturing Practices (CGMP).