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- Categories: Preservatives
Water-soluble preservative. This preservative is considered safe for use at concentrations up to 0.5%, although it’s usually present at lower concentrations because it’s typically part of a blend with other preservatives (such as parabens).
Diazolidinyl urea can be a formaldehyde-releasing preservative. Although that sounds 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.
See formaldehyde-releasing preservative
References for this information:
Steinberg, David C., Preservatives for Cosmetics, Third Edition, Allured Books, 2012, pages 67-68
Contact Dermatitis, August 2011, pages 81-91; and January 2006, pages 50-58
International Journal of Toxicology, March-April 1990, issue 2, pages 229-245
About the Experts
Paula Begoun is the best-selling author of 20 books about skincare and makeup. She is known worldwide as The Cosmetics Cop and creator of Paula’s Choice Skincare. Paula’s expertise has led to hundreds of appearances on national and international radio, print, and television including:
The Paula's Choice Research Team is dedicated to busting beauty myths and providing expert advice that solves your skincare frustrations so you can have the best skin of your life!