Urea is also known as carbamide. It's use is primarily in fertilizer and as a feed supplement. Unfortunaltey, it is used as an antiseptic and deodorizer in many cosmetic and personal care products. Naturally occurring, it is a skin conditioner and does not release formaldehyde, however Urea compounds that are created synthetically as preservatives do release formaldehyde.
This long list of cosmetic and Personal care ingredients fall into the Urea group:
From A Consumer’s Dictionary of Cosmetic Ingredients and A Guide to Toxic Ingredients
See: Formaldehyde http://bit.ly/1EG0ovq
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