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According to the NIH Office of Dietary Supplements, B12 plays a key role in: Making red blood cells and preventing megaloblastic anemia Maintaining healthy nerve function and the myelin sheath that protects nerves DNA synthesis Supporting brain function and preventing cognitive decline Converting food into energy (cellular metabolism) Because B12 is found almost exclusively in animal products meat, fish, dairy, and eggs certain groups of people are at much higher risk of deficiency than others

It may be a couple of days before you notice, or it could be sooner

Journal of Allergy and Clinical Immunology

Others have strong mechanistic evidence with clinical data still emerging