Urin contains only

Urine contains only 1.0% N.
About 91–96% of urine consists of water. The remainder can be broadly characterized into inorganic salts, urea, organic compounds, and organic ammonium salts.
Cellular metabolism generates many by-products that are rich in nitrogen and must be cleared from the bloodstream, such as urea, uric acid, and creatinine. Urine can also be used safely as a source of nitrogen in carbon-rich compost.