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While adverse effects are rare, possible side effects can include mild headaches, dizziness, or fatigue in some cases

London, UK: 2014

[DOI] [PMC free article] [PubMed] [Google Scholar] 144.Ogura, Y., Kitada, M., Xu, J., Monno, I

If youve got a more serious case of vitamin B12 deficiency, your doctor may recommend B12 shots to boost those B12 levels
