does b12 injections cause diarrhea Can Vitamin or Make You Poop More? Sublingual B12 vs. B12 Injections:
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Morava E, Baumgartner M, Patterson M, Rahman S (eds.)

By mimicking the GLP-1 hormone, it stimulates insulin secretion

Yu T, Wang YT, Chen P, Li YH, Chen YX, Zeng H, Yu AM, Huang M, Bi HC (2015) Effects of nicotinamide N -methyltransferase on PANC-1 cells proliferation, metastatic potential and survival under metabolic stress

Other risk factors include age, digestive issues like Crohns disease, or medications that interfere with B12 absorption