vd/vdr

Calcitriol (1,25-Dihydroxyvitamin D3) is a metabolite of vitamin D and a vitamin D receptor (VDR) agonist (IC50=0.4 nM). Calcitriol increases intestinal absorption of calcium and phosphorus, and increases bone resorption with parathyroid hormone.

Ergocalciferol (Vitamin D2 (Calciferol)) is a derivative of ergosterol formed by ultraviolet rays breaking of the C9-C10 bond with a strong inhibitory effect against bladder tumor promotion by sodium saccharin, and it induces cell differentiation in leukemia cells. Vitamin D2 is an inhibitor of DNA Polymerase.

25,26-Dihydroxyvitamin D3 (25,26-Dihydroxycholecalciferol) is a vitamin D3 metabolite and a precursor compound for the synthesis of 25-hydroxyvitamin D.

Calcifediol (U 32070E) is a naturally occurring product that is metabolized in the liver from vitamin D3, a VDR ligand. Calcifediol is indicated for use as a vitamin supplement for all patients with vitamin D deficiency.