You are injecting a liquid thats going to disperse into the muscle and sit there for a while, so there may be a little bit of soreness related to that. Other common side effects include diarrhea, headache, and swelling (and not only at the site of the injection)
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The human body is not capable of producing vitamin B12 on its own, there for it must be consumed in the diet
Bacteriostatic Water for Injection: Package Insert / Prescribing Info Package insert / product label Dosage form: injection, solution Drug class: Sterile irrigating solutions Medically reviewed by Drugs.com
Author contributions CC, KR, and FV conceived the study