While present in animal products, including meats, fish, shellfish, dairy products, and eggs, it is absent in plant- based foods
Metformin, commonly used to treat type 2 diabetes, affects B12 absorption through a different mechanism
Waxman JA, Sulak PJ and Kuehl TJ: Cystoscopic findings consistent with interstitial cystitis in normal women undergoing tubal ligation
TB-500 -,
People with Certain Medications Long-term use of certain medications, like proton pump inhibitors, H2 receptor antagonists, or metformin, can interfere with B12 absorption
Both injection methods have few associated side effects and deliver effective treatment