b12 injection site is warm Best Vitamin Site: Administering B12 Shots Feeling worse after B12 Injection:
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Administer as directed by your healthcare provider.

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A total of 418 participants who had T2DM were recruited among patients who visited the outpatient department clinics of the First Affiliated Hospital of Chongqing Medical University, Chongqing, China

High doses beyond the typical daily requirement are avoided unless necessary, but there is no evidence of harm to the fetus from normal vitamin B therapy
