can you have too much vitamin b12 injection B12: Symptoms, Dosage & Toxicity Risks Vitamin B12 Injections: Good or

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This typically involves: Intrinsic factor antibodies (highly specific for pernicious anaemia, though sensitivity is only 50%) [12] [28] Gastric parietal cell antibodies (more sensitive but less specific) Coeliac serology if malabsorption is suspected Consideration of upper gastrointestinal endoscopy in selected cases, particularly with autoimmune gastritis/pernicious anaemia NICE guidance emphasises that treatment should not be delayed whilst awaiting antibody results if clinical features strongly suggest deficiency, as irreversible neurological damage can occur

Link National Heart, Lung, and Blood Institute

248.Ravussin E, Smith SR, Mitchell JA, et al