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:
INGREDIENT GLOSSARY • Preservative
AT A GLANCE
A preservative that’s particularly effective against the growth of mold and fungus.
Iodopropynyl butylcarbamate, or IPBC, is a well-studied and safe preservative used widely in cosmetics. Every individual preservative has its own strengths and weaknesses; IPBC is particularly strong against mold and fungus, which makes it a great pair to preservatives that are stronger against bacteria. Stratia products use less than 0.0025% of IPBC.
Soft Touch AHA, Velvet Cleansing Milk