D3 vitamins
d3 vitamins
A vitamin D that is calciol or its hydroxylated metabolites calcidiol and calcitriol. Calciol (also known as vitamin D<small><sub>3</sub></small>) acts as a hormone precursor, being hydroxylated in the liver to calcidiol (25-hydroxyvitamin D<small><sub>3</sub></small>), which is then further hydroxylated in the kidney to give calcitriol (1,25-dihydroxyvitamin D<small><sub>3</sub></small>), the active hormone.