Calcifediol

Formula : C27-H44-O2.H2-O
CAS : 63283-36-3 

The major circulating metabolite of VITAMIN D3. It is produced in the LIVER and is the best indicator of the body's vitamin D stores. It is effective in the treatment of RICKETS and OSTEOMALACIA, both in azotemic and non-azotemic patients. Calcifediol also has mineralizing properties.

Calcifediol lactone

Formula : C27-H40-O4
CAS : 71302-34-6 

Vitamin D3 metabolite; competes actively for vitamin D binding protein in ligand assay for 25-hydroxyvitamin D3.