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The NHS confirms that taking up to 2mg (2000 micrograms) daily is unlikely to cause harm, with no established upper limit in the UK
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
Always keep the medication out of reach of children and discard any unused portion after the recommended period, in accordance with safe disposal guidelines
Finally, select an injection site, commonly the upper arm, thigh, or abdomen, and clean it with an alcohol swab
Concentration 5mg/ml Overview Methylcobalamin is an active form of Vitamin B12
