aching arm after b12 injection Possible allergic reaction to injections?? : r/B12_Deficiency B-12 Injections Specialists in San
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R.NikitopoulouE.Segarra-MondejarM.et al (2021)

This method of administration ensures maximum absorption and effectiveness, making it a preferred option for those with absorption issues or significant deficiencies
Stem Cell Res

Its not something most people need to worry about due to how rare it is, but if unusual rashes occur after starting B12, speak with your doctor, and a skin patch test to check for allergies to metals may help to identify an issue

So, what can cause B12 deficiency
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