how to administer b12 injections at home self-inject intramuscular vitamin - Overview How to Give Yourself a

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Pernicious anemia is a type of B12 deficiency that causes fewer red blood cells to form

History [edit] Descriptions of deficiency effects [edit] Between 1849 and 1887, Thomas Addison described a case of pernicious anemia, William Osler and William Gardner first described a case of neuropathy, Hayem described large red cells in the peripheral blood in this condition, which he called "giant blood corpuscles" (now called macrocytes), Paul Ehrlich identified megaloblasts in the bone marrow, and Ludwig Lichtheim described a case of myelopathy

Andres E, Dali-Youcef N, Serraj K et al

Adverse reactions reported following methylcobalamin administration include headache, infection, nausea/vomiting, paresthesias, and rhinitis