Ergocalciferol (vitamin D2) is a form of vitamin D. Ergocalciferol is a secosteroid formed by a photochemical bond breaking of a steroid, specifically, by the action of ultraviolet light on ergosterol. Viosterol, the name given to early preparations of irradiated ergosterol, is essentially synonymous with ergocalciferol.Ergocalciferol may be used as a vitamin D supplement, and a 2011 clinical guideline considered it to be as effective as cholecalciferol (vitamin D3) which is produced naturally by the skin when exposed to ultraviolet light. As a professional Vitamine D2 supplier and manufacturer of food additives, Foodchem International Corporation has been supplying quality Vitamine D2 to customers all over the world for over 10 years. If you have any questions or wish to receive a quote, please feel free to reach us by email:inquiry@foodchem.cnor by phone: +86 21 2206 3075. Our sales person will get back to you in 1 working day.