injectable vitamins b12 label CYANOCOBALAMIN INJECTION, USP swine and sheep. Compounded Cyanocobalamin (Vitamin B12) Injection

The abdomen, thigh, and upper arm are approved injection sites

BOMSS, Royal College of General Practitioners and the British Dietetic Association do not endorse any particular brand of oral supplementation, however patients may wish to source oral vitamin B12 as below

Les personnes souffrant d'une anmie par carence de B12 (anmie pernicieuse) et prsentant des symptmes de dpression, de grande fatigue, d'anmie et de mmoire dfaillante ont souvent besoin d'injections de vitamine B12 s'imposent [1]

Reported side effects are generally mild and include temporary gastrointestinal discomfort, headaches during initial use, occasional fatigue as the body adjusts, and rare nausea, especially when taken without food