cost of a b12 injection Vitamin Injections (Cyanocobalamin Injections) — Mountainside Medical Veterinarians may prescribe vitamin B12 injections to animals with a deficiency Buy B12 Shots and Injections
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doi: 10.1056/NEJM198806303182604

Patients with a history of severe gastrointestinal disease, particularly those with inflammatory bowel disease, severe gastroesophageal reflux disease, or history of pancreatitis, require careful evaluation before considering this therapy

This means that high serum B12 levels can persist for some time after large supplemental doses
