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The majority of nitrogen which enters the body does so in the form of protein, which is composed of amino acids. Once the protein is broken down into these subunits, it enters the bloodstream where the cells of the body can absorb it and use it in many different ways. Excess amino acids (and thus excess nitrogen), along with cellular wastes containing nitrogen, are eventually filtered out of the blood by the kidneys and excreted in the urine in the form of urea, a waste product.

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Q: Where does nitrogen go after it enters the human body?
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