aching arm after b12 injection painful why does my hurt pain arm after a shot? B12 Injections for Energy: Benefits – Vitamin Injections Is intense whole arm pain

Each patch contains 1000 mcg of Vitamin B12 and is individually packaged for convenience

Even after reaching your target weight, B12 plays a role in keeping energy levels steady promoting overall wellness, and maintaining balance in and outside of the body

Patient safety remains the primary consideration when determining MIC B12 injection protocols

A search of ClinicalTrials.gov under "AOD-9604" returns no active or completed trials in the adolescent age group as of mid-2025 [9]

Still, if that's what you're getting, then I would suspect that as potentially the problem

Patch test any new product first, and discontinue if you notice irritation