1α,25-二羟基维生素 D3[1,25(OH)2D3或骨化三醇] 是维生素 D3的代谢产物。现已确知它监测人类中钙和磷酸盐的代谢。它还调节胰岛素分泌并诱导细胞分化。1α,25-二羟基维生素 D3 (6,19,19-d3) 是氘化的维生素D3，其中的C-6和C-19质子被氘取代。 应用 1α,25-二羟基维生素 D3(6,19,19-d3) 可用作分析内标物，用于定量分析膳食补充剂、强化食品或复杂生物基质中的维生素D3浓度。 1α,25-Dihydroxyvitamin D3[1,25(OH)2D3or calcitriol] is a metabolite of vitamin D3. It is known to monitor calcium and phosphate metabolism in humans. It also regulates insulin secretion and induces cellular differentiation. 1α,25-Dihydroxyvitamin D3 (6,19,19-d3) is a deuterated vitamin D3wherein C-6 and C-19 protons are replaced by deuterium.1α,25-Dihydroxyvitamin D3(6,19,19-d3) can be used as an internal analytical standard for the quantification of vitamin D3concentration in dietary supplements, fortified foods or within a complex biological matrix