Side effects of B12 deficiency can include decreased cognitive function, fatigue, lethargy, feeling faint, depression or irritability, headache, balance issues and more
Known Side Effects Reported side effects are generally mild and infrequent: Injection site reactions: temporary redness, mild swelling, or tenderness Nausea: occasionally reported, usually mild and transient Dizziness: rare, typically with first doses Fatigue: some users report temporary tiredness Headache: infrequent, usually resolves quickly These effects typically diminish with continued use and rarely require treatment discontinuation
Comparing COVID-19 vaccines for their characteristics, efficacy and effectiveness against SARS-CoV-2 and variants of concern: a narrative review
Many people think that B12 deficiency can lead to hair loss or alopecia, however, there is little evidence to suggest this is the case
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10.1007/s12264-018-0269-8 22 WangY.LomakinA.KanaiS.AlexR.BelliS.DonzelliM.et al (2016)