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Normally no, apart from an achy muscle at the injection site, which normally does not last for more than an hour or so
Vials (50 mg each, subcutaneous route only) One 50 mg vial lasts about 10 to 20 days at 2.5 to 5 mg per day
Potential Side Effects of B12 Shots Although it is rare some people can have some mild to more severe side effects from vitaminB12 shots
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doi:10.1038/s41598-021-03670-5 (PMID 35013352) Disclaimer: This article is for educational and research purposes only
