1.NounA physiologically active metabolic derivative .mw-parser-output .template-chem2-su{display:inline-block;font-size:80%;line-height:1;vertical-align:-0.35em}.mw-parser-output .template-chem2-su>span{display:block;text-align:left}.mw-parser-output sub.template-chem2-sub{font-size:80%;vertical-align:-0.35em}.mw-parser-output sup.template-chem2-sup{font-size:80%;vertical-align:0.65em}C27H44O3 of cholecalciferol (1,25-dihydroxycholecalciferol) that is synthesized in the liver and kidney and stimulates the intestinal absorption of calcium.