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It may take 48 to 72 hours for the vitamin to disperse throughout the body via the circulatory system
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While B12 has very low toxicity as a water-soluble vitamin with excess typically excreted in urine, rare adverse reactions can occur
Then, they get weekly injections until they start to get better
Last clinically reviewed: 31 July 2026 Clinical information sources NICE NG239 Vitamin B12 deficiency in over 16s: diagnosis and management NHS Vitamin B12 or folate deficiency anaemia NHS Diagnosis NHS Treatment MHRA Vitamin B12 and cobalt allergy advice This page provides general information about the pharmacy service and does not replace personalised advice from a pharmacist, GP or other healthcare professional
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