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
Patients may sometimes experience breathing problems, hives, and swelling, although mild
Semaglutide is best suited for people with significant weight to lose, typically those with a BMI of 30 or higher, or 27 or higher with weight-related health conditions
Hydroxocobalamin is a form of vitamin B12 used to treat Vitamin B12 deficiency
[1] [4] Mood changes including low mood, irritability, or anxiety can be associated with declining B12 levels, though these symptoms are non-specific and can have many causes