Description General description Vitamin D2 (6,19,19-d3) is a deuterated vitamin D2 wherein C-6 and C-19 protons are replaced by deuterium. Vitamin D2, also known as ergocalciferol, is produced by plants and mushrooms in the presence of sunlight. Application Vitamin D2 (6,19,19-d3) can be used as an analytical standard for the quantitative analysis of vitamin D2 concentration in human blood via LC-MS/MS. Packaging This product may be available from bulk stock and can be packaged on demand. For information on pricing, availability and packaging, please contact Stable Isotopes Customer Service.