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Description
It requires a specific protein produced in the stomach to bind to the B12 molecule, and then specialised receptors in the lower small intestine to actually take it up into the body

Fantin, V

10.1002/smll.202308574 42 JiaY.KongX.LiR.WangH.LiC.ChengS.et al (2025a)

Side effect Resting heart rate increase Approx
