Calciferols | definition of Calciferols by Medical dictionary
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Activated ergosterol, the vitamin D of plant origin; it arises from ultraviolet irradiation of ergosterol, which is cleaved at the 9,10 bond and develops a double bond between C-10 and C-19; used in prophylaxis and treatment of vitamin D deficiency.
calciferol (kăl-sĭf′ə-rôl′, -rōl′)
calciferol A vitamin D derived from steroids by breaking the B ring’s 9-10 bond (e.g., cholecalciferol and ergocalciferol), which is produced by the body when exposed to UV light. Supplemental vitamin D3 reduces all-cause mortality, especially in elderly women, an effect not seen with vitamin D2, alfacalcidol or calcitriol (intrinsic vitamin D). However, too much or too little vitamin D is associated with increased mortality in a U-shaped risk curve.
calciferol Vitamin D. A fat-soluble vitamin necessary for the absorption of calcium from the intestine. Deficiency causes RICKETS in infants and OSTEOMALACIA in adults.
vitamin D2 a compound that has vitamin D properties and is obtained by ultraviolet irradiation of ergosterol.
Activated ergosterol, the vitamin D of plant origin; used in prophylaxis and treatment of vitamin D deficiency.
, vitamin D2