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[–] BRITTEACH 5 points -3 points (+2|-5) ago 

I think it is expelled in urine and feces.

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[–] MyNameIsMud 0 points 6 points (+6|-0) ago  (edited ago)

It is exhaled through your mouth and nose, actually. source

A small bit does come out through urine though, but not feces if my understanding is correct.