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
Unless specified in batch documentation, the vial contains only the research-grade L-carnitine compound
[16] Although cyanocobalamin lacks a defined upper-toxicity threshold due to its water solubility and renal elimination, exceptionally high cumulative doses have been temporally associated with acneiform eruptions, altered potassium homeostasis, and theoretical thrombotic risk, emphasizing the importance of evidence-based dosing
Seek medical attention if your symptoms get worse or are severe
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these are brand names for semaglutide