Quaternium-15
Diazolidinyl ureaImidazolidinyl ureaFormaldehyde-releasing agent
Preservative
Formaldehyde releasers are chemicals that slowly release tiny amounts of formaldehyde, a known carcinogen. They're often used in personal care products like shampoos and lotions to prevent the growth of bacteria and mold.
High Concern
Source: EWG Skin Deep
The concern is that formaldehyde is a known human carcinogen, and exposure to it can increase the risk of cancer.
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r/stories
5838
I work as a morgue doctor. Our janitor can stop a family's grief in two minutes, but his price is horrifying.
Patterns of positive patch test reactions to formaldehyde and formaldehyde releasers at the Finnish Institute of Occupational Health from 2007 to 2020.
Aalto-Korte K, Pesonen M
2021
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Last updated: May 16, 2026