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Description
Causes The color of the blood in the stools can indicate the source of bleeding
Mut Res 1996

But people can get blemishes from flu shots, so there is no direct correlation that B12 causes blemishes. Unfortunately though, theres no way to know beforehand if B12 will cause a breakout

Oct 1 2016;164(Pt A):68-85

Arterburn D, Wellman R, Emiliano A, et al

Hello Corrine
