Quaternium-15
Formaldehyde-releasing preservative. Gradually releases formaldehyde inside the product and often triggers contact allergy.
Evidence by route
Topical application
DVery weak or conflicting data.
Strong contact sensitizer that tops patch-test clinic lists. Modern brands replace it with phenoxyethanol and organic acids.
Tolerability and safety
Irritation potential
MediumAllergen risk
HighPregnancy
CautionSkin types
Use with caution
Sensitive
Frequently asked questions
Is Quaternium-15 safe during pregnancy?
Quaternium-15 should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.
What skin types is Quaternium-15 for?
Use with caution in: sensitive.
Can Quaternium-15 irritate the skin?
Quaternium-15 has moderate irritation potential. Sensitive skin may show a transient reaction that usually settles with adaptation.
Can Quaternium-15 cause an allergic reaction?
Quaternium-15 has high allergen potential. Perform a patch test on the inner forearm 24 hours before facial application.