Description General description 1α,25-Dihydroxyvitamin D3 [1,25(OH)2D3], also known as calcitriol, plays a role in 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 D3 wherein C-6 and C-19 protons are replaced by deuterium. Application 1α,25-Dihydroxyvitamin D3 (6,19,19-d3) can be used as a stable isotope internal standard for accurate data interpretation in specific biological samples by mass spectrometry. Packaging 1 mL in ampule