25-Hydroxyvitamin D2 Description Biologically active metabolite of vitamin D2 which is more active in curing rickets than its parent. The compound is believed to attach to the same receptor as vitamin D2 and 25-hydroxyvitamin D3. Specifications Cas No. 21343-40-8 Product ID H9814 Product Name 25-Hydroxyvitamin D2 Formula Wt. 412.65