The only requirement is that the drug gets delivered via the subcutaneous or intramuscular route, not intravenously
B vitamins are involved in a variety of physiologic processes, including supporting normal nervous system function, red blood cell production, and cellular health
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
Dizziness: Rare, but reported occasionally, especially if injecting without eating for extended periods afterward