21 CFR § 184.1923 - Urea.
(a) Urea (CO(NH2)2, CAS Reg. No. 57-13-6) is the diamide of carbonic acid and is also known as carbamide. It is a white, odorless solid and is commonly produced from CO2 by ammonolysis or from cyanamide by hydrolysis.
(b) The ingredient must be of a purity suitable for its intended use.
(c) In accordance with § 184.1(b)(1), the ingredient is used in food with no limitation other than current good manufacturing practice. The affirmation of this ingredient as generally recognized as safe as a direct human food ingredient is based upon the following current good manufacturing practice conditions of use:
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