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Finkelstein JD, Harris BJ, Martin JJ: Methionine metabolism in mammals: Concentrations of metabolites in rat tissues
A B12 injection is an intramuscular shot of Vitamin B12, delivering it directly into the bloodstream for near-complete absorption far more effective than oral supplements, particularly for those with absorption issues

A veterinarian should decide on the appropriate dosage and treatment schedule, depending on the condition and vitamin B12 levels of the dog
British Society of Gastroenterology guidelines on the diagnosis and management of Barretts oesophagus