For a comprehensive analysis of all safety data and research on diazolidinyl urea, you can read the International Journal of Toxicology’s Final Safety Assessment:
- https://journals.sagepub.com/doi/abs/10.3109/10915819009078735
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INGREDIENT GLOSSARY • Preservative
Diazolidinyl Urea
AT A GLANCE
Diazolidinyl Urea
A safe and effective preservative that prevents the growth of bacteria.
Type of Ingredient
Preservative
Why we use it
Diazolidinyl urea, or DU, is a common preservative used to keep skincare safe and free of bacteria. It releases a tiny amount of formaldehyde - a fraction of the amount found in a medium-sized pear. Stratia products contain less than 0.2% diazolidinyl urea.
What it’s in
Interface, Lipid Gold, Lipid Gold Eye Cream, Rewind, Velvet Cleansing Milk, Soft Touch AHA, Night Shift