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Hydroxyethylcellulose

HEC

Well toleratedThickenerthickenerfilm-formeremulsion-stabiliser

No meaningful concern for most people; irritation is possible but rare.

Also written as: HEC · Hydroxyethyl Cellulose · Cellulose hydroxyethyl ether

What it is

Hydroxyethylcellulose is plant cellulose treated with ethylene oxide so that it dissolves in water instead of staying an insoluble fibre. It produces clear, smooth gels that are stable across a wide pH range and do not pill or feel sticky. It is one of the most common thickeners in gel masks, cleansing gels and hydrating essences.

What it does well

  • Produces clear, stable gels with a clean, non-tacky feel

    It is a workhorse thickener chosen precisely because it is pH-tolerant, compatible with most actives, and does not add stickiness. It stays on the surface and is not absorbed.

    Strong evidence

Worth knowing

  • Purely a texture ingredient

    Hydroxyethylcellulose contributes nothing to skin condition. It is included for feel and stability, and its presence high in an ingredient list tells you about texture, not efficacy.

    Matters most toAnyone reading ingredient lists and trying to judge how active a product is.

Where the EU stands

No specific restriction

Not restricted under the EU Cosmetics Regulation; it appears in no annex and has no concentration limit.

Masks that contain Hydroxyethylcellulose