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Post-Surgical Care: Patients who have undergone gastrointestinal surgeries, such as gastrectomies or ileal resections, may face challenges in absorbing B12 from food due to changes in the digestive process

(2013) Biochimica et Biophysica Acta | Al-Mekhlafi A

How long does it take to see results

According to the NIH Office of Dietary Supplements, vitamin B12 is available as cyanocobalamin and hydroxocobalamin, which are typically administered parenterally by intramuscular injection to bypass gastrointestinal absorption barriers

(PubMed) Putignano S, Gareri P, Castagna A, et al

This is particularly important given the variable blood pressure effects different users experience