Helpful Patient Education Cyanocobalamin Injection, USP is a vitamin B12 injection used for vitamin B12 deficiency related to malabsorption, including pernicious anemia and certain gastrointestinal conditions
Managing Reactions at Home For mild localized irritation, try: Cold compress after injection to reduce swelling Warm compress 24 hours later to help absorption Topical arnica or Traumeel cream for bruising Over-the-counter antihistamines (e.g., Claritin, quercetin) for itching Zinc or vitamin C supplementation to support skin healing Hydration helps disperse and absorb SubQ fluids faster If symptoms dont improve within 4872 hours, consult your provider
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[DOI] [PMC free article] [PubMed] [Google Scholar] 92.Hou D, Hu F, Mao Y, Yan L, Zhang Y, Zheng Z, et al
I think he says it's fine