Editing Urea (section)

==Adverse effects==
Urea can be irritating to skin, eyes, and the respiratory tract. Repeated or prolonged contact with urea in fertilizer form on the skin may cause [[dermatitis]].<ref>{{Cite book |last1=Schliemann |first1=S. |url=https://books.google.com/books?id=0yyx-DzCymIC&dq=Urea+can+be+irritating+to+skin&pg=PA52 |title=Skin Protection: Practical Applications in the Occupational Setting |last2=Elsner |first2=Peter |date=2007-01-01 |publisher=Karger Medical and Scientific Publishers |isbn=978-3-8055-8218-6 |language=en}}</ref>

High concentrations in the blood can be damaging. Ingestion of low concentrations of urea, such as are found in typical human [[urine]], are not dangerous with additional water ingestion within a reasonable time-frame. Many animals (e.g. [[Camel urine|camel]]s, rodents or dogs) have a much more concentrated urine which may contain a higher urea amount than normal human urine.

Urea can cause [[algal bloom]]s to produce toxins, and its presence in the runoff from fertilized land may play a role in the increase of toxic blooms.<ref>{{cite journal|url=https://www.nature.com/news/2008/081027/full/news.2008.1190.html|title=Urea pollution turns tides toxic|first=Amy|last=Coombs | name-list-style = vanc |date=27 October 2008|journal=Nature|access-date=5 August 2018|doi=10.1038/news.2008.1190}}</ref>

The substance decomposes on heating above melting point, producing toxic gases, and reacts violently with strong oxidants, nitrites, inorganic chlorides, chlorites and perchlorates, causing fire and explosion.<ref>[https://www.cdc.gov/niosh/ipcsneng/neng0595.html International Chemical Safety Cards: UREA]. cdc.gov</ref>