Formaldehyde
preservative
- Cancer concern:Classified as carcinogenic to humans (IARC Group 1).
- Allergy risk:Potent contact allergen and sensitizer.
- Irritation:Irritates skin, eyes and airways at low concentrations.
A preservative now rarely listed directly on labels but still released by several common preservatives. It is a known human carcinogen and one of the most common causes of preservative contact allergy.








