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When you swallow a B12 pill, several steps have to work for it to be absorbed: stomach acid and the enzyme pepsin must release B12 from food or the supplement, the stomach must secrete a protein called intrinsic factor that binds to B12, and the B12-intrinsic factor complex must reach the ileum (the end of the small intestine) where it is finally absorbed
The practical takeaway is that formulation quality and delivery method are not minor details, they are part of whether the peptide does anything at all
Future studies using varied diets are needed to determine whether the predominance of Ileibacterium in the cecal microbiome holds pathological relevance
Reported side effects from clinical practice: Contraindications: Pregnancy, breastfeeding, active cancer, and known hypersensitivity
