The ingredient, explained

Glycolic Acid

An exfoliating acid studied in leave-on creams and much stronger short-contact peels.

AHA exfoliantBuffering

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Ingredient guide

What it is and what it does

Acetic acid, hydroxy-

About this ingredient: EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗

AHA exfoliant: Alpha hydroxy acid category. Exfoliation depends on the acid, concentration, pH and the rest of the formula; an AHA may also be used to control pH.
Buffering: Helps resist changes in a formula's pH.

Function definitions: FDA: Alpha hydroxy acids ↗ · European Commission ingredient function definitions (SCCNFP/0299/00, pages 16 to 20) ↗

Registry functions describe possible formulation roles, not results for a finished product. A dictionary entry is not an approval or a safety assessment.

A closer look

What the research shows

Human topical research

In a 74-woman, 22-week vehicle-controlled trial, 8% glycolic acid cream produced modest improvements in facial photodamage. A separate 41-volunteer study reported improvements in texture and fine wrinkling after weekly five-minute applications of a 50% peel for four weeks.

What this does not tell us

The concentration, acidity, vehicle and contact time differ markedly between these studies. Peel outcomes cannot be transferred to a lower-strength daily product. One participant withdrew from the cream trial because of irritation.

Sources for this summary. PubMed 8651713 ↗PubMed 8634809 ↗

Research review checked Sep 30, 2026

Selected primary sources were reviewed for the existing research brief on 30 September 2026, with exact ingredient, route and combination limitations recorded. This was a bounded editorial review, not a systematic search.

Ingredient research is not proof that a product containing this ingredient works.