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Short answer: excretes!
Medium: our bodies need lots of things to be healthy (over 50 different substances) and are really good at taking just what we need from our intake (by breathing, swallowing, sometimes absorption through skin and intravenous injection) by absorbing only so much AND excreting the extra.
The things excreted would build up inside us and poison us if they were not kicked out of our bodies. Really and for sure.
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