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