how do you give a b12 injection Choosing the Right Needle and Syringe for Injections: Complete Guide B12 Shots at Home: How,

[27] Additionally, anyone with Lebers hereditary optic neuropathy (a rare inherited eye disease) must avoid cyanocobalamin injections, since B can precipitate rapid worsening of that condition

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Pernicious AnemiaPernicious anemia is a blood disorder in which the body does not make enough red blood cells due to a lack of vitamin B12 in the blood