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|Section2= |Section6= }} 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.〔Science Service (1930) Viosterol official name for irradiated ergosterol, J. Chem. Educ. 7(1) 166, DOI: 10.1021/ed007p166, see , accessed 10 July 2014.〕 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. It is manufactured and marketed under various names, including Deltalin (Eli Lilly and Company), Drisdol (Sanofi-Synthelabo) and Calcidol (Patrin Pharma). ==Sources== Lichen * ''Cladina arbuscula'' specimens grown under different natural conditions: The contents of vitamin D3 range from 0.67 to 2.04 μg/g dry matter in the thalli of ''C. arbuscula'' specimens grown under different natural conditions, while provitamin D3 could not be detected. The ranges for provitamin D2 and vitamin D2 were 89-146 and 0.22-0.55 μg/g dry matter, respectively, while the contents of provitamin D3 were below the detection limit (0.01 μg/g dry matter). Fungus, from USDA nutrient database (per 100g) * Mushrooms, portobello, exposed to ultraviolet light, raw: Vitamin D (D2 + D3): 11.2 µg (446 IU) * Mushrooms, portobello, exposed to ultraviolet light, grilled: Vitamin D (D2 + D3): 13.1 µg (524 IU) * Mushrooms, shiitake, dried: Vitamin D (D2 + D3): 3.9 μg (154 IU) * Mushrooms, shiitake, raw: Vitamin D (D2 + D3): 0.4 μg (18 IU) * Mushrooms, portobello, raw: Vitamin D (D2 + D3): 0.3 μg (10 IU) Plantae * Alfalfa (''Medicago sativa'' subsp. sativa), shoot: 4.8 μg (192 IU) vitamin D2, 0.1 μg (4 IU) vitamin D3 Ergocalciferol is produced in fungi synthetically through irradiation of ergosterol. Human bioavailability of vitamin D2 from vitamin D2-enhanced button mushrooms via UV-B irradiation is effective in improving vitamin D status and not different from a vitamin D2 supplement. Vitamin D2 from UV-irradiated yeast baked into bread is bioavailable. By visual assessment or using a chromometer, no significant discoloration of irradiated mushrooms, as measured by the degree of "whiteness", was observed. Claims that a normal serving of mushrooms treated with ultraviolet light provides the equivalent of 3,500 International Units of vitamin D when exposed to ultraviolet light after harvest have gained popular attention. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ergocalciferol」の詳細全文を読む スポンサード リンク
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