b12 injection im or subcutaneous Injections at Home - Safety Guide for Self-Administration is b12 injection im vitamin

The most commonly reported side effects were mild and included headache, minor gastrointestinal disturbances (flatulence, mild diarrhea at high doses), upper respiratory symptoms, and mild injection site reactions

For example, if you are administering a 1-2ml injection, a 3ml syringe can help by holding the larger syringe while drawing the B12

Marks are less fine (0.1 mL), so it's a bit less precise for small doses

JEOL, Tokyo, Japan)

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