nausea after b12 injection Shots: Benefits, Uses, Safety, Cost & How They Work Why Do I Feel Worse
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Acknowledgements We would like to thank Bruce Wolffenbuttel and Andrew McCaddon for their advice and assistance of this perspective

The injection comes in a vial and is typically given once a week or as directed by your doctor

A deficiency often takes some time to develop, and may not always show symptoms immediately

[DOI] [PMC free article] [PubMed] [Google Scholar] 77.Gil A.P.R., Katsa M.E

Hydroxocobalamin regimen (UK example): 1 mg (1000 g) IM three times a week for 2 weeks (loading), then 1 mg every 3 months thereafter