how quickly does a b12 injection take to work Do Shots Work? How Fast Do B12 Injections
Description
Proton pump inhibitors or histamine type 2 (H2)-receptor antagonists: Medications to treat gastric disorders that interfere with or suppress gastric acid and intrinsic factor production can lead to decreased vitamin B12 absorption (3) (4)

PubMed U.S

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Patients following bariatric surgery, GI disease, or with malabsorption syndromes
