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diazolidinyl urea

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Preservatives

Water-soluble preservative. This preservative is considered safe for use at concentrations up to 0.5%, although it is usually present at lower concentrations because it is only one part of a blend with other preservatives (such as parabens).

Diazolidinyl urea can be a formaldehyde-releasing preservative. Although that sound scary, the amount of formaldehyde released is well below the recommended limits of exposure. Moreover, other ingredients (such as proteins) in a product cause the free formaldehyde to evaporate and become inactive before it could possibly harm skin.

References for this information:

International Journal of Toxicology, March-April 1990, issue 2, pages 229-245

See formaldehyde-releasing preservative

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