how quickly does a b12 injection take to work Are Vitamin Shots Right for You? How Long Does It Take
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According to the Mayo Clinic, if your vitamin deficiency is severe enough to make you feel lethargic, you could gain weight as a result of reducing your exercise and movement

ClinicalTrials.gov (2024) 12

First Aid: If poisoning occurs, contact a doctor or Poisons Information Centre

Drug Interactions Neomycin, colchicine, para-aminosalicylic acid, or excessive alcohol intake longer than two weeks may cause malabsorption of vitamin B12
