The ingredient, explained

Citric Acid

Citric acid has direct human research at a high topical concentration.

AHA exfoliantBufferingChelatingMasking

Ingredient guide

What it is and what it does

Citric acid can help control a formula's pH and bind metal ions that affect stability. It is also an alpha hydroxy acid. Its presence in an ingredient list does not establish an exfoliating effect, which depends on concentration, pH and the rest of the formula.

About this ingredient: CosIng identity and functions via Open Beauty Facts ↗ · European Commission ingredient function definitions ↗ · FDA: Alpha hydroxy acids ↗

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.
Chelating: Binds metal ions that can affect product stability or appearance.
Masking: Reduces or conceals the formula's underlying odour or taste.

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

Biopsies after three months showed thicker viable epidermis and more dermal glycosaminoglycans.

What this does not tell us

Histological endpoints and a 20% lotion do not establish benefits from low-level pH adjustment in another product.

Sources for this summary. PubMed 9256916 ↗

Research review checked Oct 1, 2026

Bounded review of supplied local candidates (492 candidate records), selective exact-name title/abstract screening, and targeted indexed primary-source searches. Not a systematic review or a claim of exhaustive coverage.