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The B12 found in supplements typically doesn't need stomach acid to be absorbed

The importance of AP-1B-mediated maintenance of epithelial integrity in systemic immune homeostasis is currently under investigation

Intestinal barrier The intestinal epithelium is the largest contact site between the external environment and the internal milieu

However, if you do have blood work done note that the drawback is that the current widely used test to check B12 levels only measures the total amount o vitamin B12 in your blood, meaning, it measures the forms of active B12 which your body can use and process as well as the inactive forms which cannot