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B12 has also been loosely linked to serotonin production, the brain chemical that promotes good moods and wards off depression

Indications Vitamin B-Complex Injection may be used for: Prevention and treatment of B-vitamin deficiencies

Researchers note its particular effectiveness in countering symptoms of erectile dysfunction in men [9, 10, 11]

[6] After parenteral delivery, cyanocobalamin binds transcobalamin II, permitting receptor mediated endocytosis into virtually all nucleated cells

GPs can prescribe B12 injections following appropriate investigation, which should include: Full blood count to identify macrocytic anaemia Serum B12 and folate levels to confirm deficiency (using laboratory-specific reference ranges) Methylmalonic acid and/or homocysteine when B12 results are borderline Intrinsic factor antibodies if pernicious anaemia is suspected Additional tests depending on clinical presentation (e.g., thyroid function, coeliac serology) When both B12 and folate deficiency are present, B12 should be replaced before folate to avoid precipitating subacute combined degeneration of the spinal cord