Research indicates that there may be adverse effects of intramuscular vitamin B12, or B12 injections
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Some research also suggests that if you become vitamin B12 deficient, it can increase your risk of age-related macular degeneration (AMD), which is a gradual type of vision loss common in people over 50
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It falls within the J-code category, which CMS maintains for drugs administered other than orally, typically by injection or infusion
an unusual or allergic reaction to methylcobalamin, cobalt, other medicines, foods, dyes, or preservatives