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更多关于已证实属于一般公认为安全（GRAS）的可直接加入食品中的物质种类，请点击美国FDA 21 CFR 第184部分已证实属于一般公认为安全（GRAS）的可直接加入食品中的物质种类汇总
§ 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 CO2by 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:
（1） The ingredient is used as a formulation aid as defined in §170.3（o）（14） of this chapter and as a fermentation aid.
（2） The ingredient is used in yeast-raised bakery products; in alcoholic beverages as defined in §170.3（n）（2） of this chapter; and in gelatin products.
（d） Prior sanctions for this ingredient different from the uses established in this section do not exist or have been waived.
[48 FR 51616, Nov. 10, 1983, as amended at 49 FR 19816, May 10, 1984; 73 FR 8608, Feb. 14, 2008]
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