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When B12 levels become problematic: High-dose supplementation (particularly doses exceeding 1,000 micrograms daily) Frequent B12 injections without medical supervision Underlying conditions affecting B12 metabolism Concurrent use of multiple B12-containing supplements The NHS does not set an upper safe limit for vitamin B12 because harmful effects from excessive intake have not been definitively established

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Injection Technique General subcutaneous technique, following established clinical best-practice guidance [14] [15]

Suitability before injection Tell the team about previous B12 treatment, allergies, medicines, pregnancy status where relevant, and any diagnosis or blood results you already have