giving yourself vitamin b12 injections at Home - Safety Guide for Self-Administration How to Self-Inject Vitamin B12
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It can also reduce hair breakage and help nails become stronger

B12 Side Effects in Elderly: Safety Guide for Older Adults Vitamin B12 supplementation is commonly prescribed for elderly patients, as deficiency becomes increasingly prevalent with age due to reduced gastric acid production, pernicious anaemia, and medication interactions
Rapid red blood cell turnover : Can cause electrolyte shifts (especially low potassium), leading to dizziness or fatigue

[DOI] [PubMed] [Google Scholar] 27.Schweiger M, Romauch M, Schreiber R, Grabner GF, Hutter S, Kotzbeck P, et al