Is propylene glycol an allergen or an irritant?

Propylene glycol causes both true allergic reactions and simple dose-dependent irritation.

A solvent and humectant that can cause both true allergic reactions and simple irritation. Distinguishing the two matters, because irritation is dose-dependent and allergy is not.

Ingredients in this family (2)

PROPANEDIOL
PROPYLENE GLYCOL

Evidence

Source:: Jacob SE, Scheman A, McGowan MA. Dermatitis. 2018;29(1):3-5
Member list is:: complete for this family
What this does not establish:: Whether you personally react. Contact allergy is confirmed by patch testing, not by an ingredient list.
Last reviewed:: 2026-09-26

Information, not medical advice. A suspected contact allergy should be confirmed by a dermatologist through patch testing.

Is propylene glycol an allergen or an irritant?

Propylene glycol causes both true allergic reactions and simple dose-dependent irritation.

A solvent and humectant that can cause both true allergic reactions and simple irritation. Distinguishing the two matters, because irritation is dose-dependent and allergy is not.

Ingredients in this family (2)

PROPANEDIOL
PROPYLENE GLYCOL

Evidence

Source:: Jacob SE, Scheman A, McGowan MA. Dermatitis. 2018;29(1):3-5
Member list is:: complete for this family
What this does not establish:: Whether you personally react. Contact allergy is confirmed by patch testing, not by an ingredient list.
Last reviewed:: 2026-09-26

Information, not medical advice. A suspected contact allergy should be confirmed by a dermatologist through patch testing.