CAS 67-97-0 Molecular formula C27H44O Molecular weight 384.64 Categories Vitamin and amino acid Quality standard USP30 Package In 1 kg aluminum foil bag Chemical Properties Crystalline Usage The vitamin that mediates intestinal calcium absorbtion, bone calcium metabolism and probably, muscle activity. Occurs in and is isolated from fish liver oils. Vitamin D acts through a receptor that is a member of the ligand-dependent transcription factor