Calcifediol
Calcifediol (25-hydroxyvitamin D3, calcidiol) is the liver-made circulating metabolite of vitamin D3 and precursor of calcitriol, used as a supplement and as RAYALDEE for CKD secondary hyperparathyroidism; it raises serum 25(OH)D faster and about 3.2-fold more potently than cholecalciferol.