Methylcobalamin Hydrate is a coenzyme necessary for the biosynthesis of methionine and plays a role as a vitamin (hematopoietic). It functions as a histamine receptor in Alzheimer's research. Additionally, it is used in studies of peripheral neuropathy, diabetic neuropathy, and serves as a preliminary research tool for amyotrophic lateral sclerosis. It can be utilized in the prevention or investigation of conditions arising from vitamin B12 deficiency, such as pernicious anemia.