A denaturant used at low levels. It makes alcohol undrinkable and does not affect skin in the finished product.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
A technical denaturant. Safe at cosmetic levels.
Diethyl phthalate (INCI: Diethyl Phthalate) is used in cosmetics at minimal doses as an alcohol denaturant: it makes alcohol bitter and unfit to drink. It also appears as a fragrance fixative. In the finished product at those concentrations it has no action on the skin. This is a functional component, not a skincare active. It does not hydrate, soothe, or improve the barrier. Its job is technical and sits outside the cosmetic performance measured in a product's actives. A note is worth adding: phthalates draw safety debate, but diethyl phthalate is not among those restricted by the EU cosmetic regulation, and its use is permitted. Even so, some prefer to avoid it out of personal caution. For topical use the systemic contribution is negligible, and it can be used during pregnancy and breastfeeding. Skin tolerance is good, with low irritation and allergy potential. It is not noted as comedogenic or drying.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
The Evigrade extension adds an evidence panel to iHerb, Sephora, Druni and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Diethyl Phthalate is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
Diethyl Phthalate suits: normal, dry, combination, oily, sensitive.
A denaturant used at low levels.
The INCI name is Diethyl Phthalate. It may also appear as: Диэтилфталат, DEP.
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