Description General description 25-Hydroxyvitamin D2 (ergocalciferol or 25-hydroxycalciferol) is a metabolite of vitamin D found in the liver. It is one of the most common forms of vitamin D circulating in the body and plays an important role in determining vitamin D deficiency.15} Application 25-Hydroxyvitamin D2 can be used as an analytical standard for the quantitative analysis of 25-Hydroxyvitamin D2 content in biological fluids via LC-MS/MS. Packaging 1 mL in ampule