Is urea a protein?

No, urea is not protein.

Urea:

1. Urea is a non-proteinaceous nitrogen compound that is synthesized in the liver.
2. The ammonia produced in the body is toxic and is converted into urea via the urea cycle.
3. Once formed, urea enters the bloodstream, is filtered by the kidneys, and is eventually excreted in the form of urine.