The ingredient, explained

Tranexamic Acid

An ingredient studied in topical solutions and gels for melasma; topical and oral treatment are different routes.

Tyrosinase inhibitor / brighteningAstringentSkin conditioning

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Ingredient guide

What it is and what it does

Cyclohexanecarboxylic acid, 4--aminomethyl--, trans-

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

Tyrosinase inhibitor / brightening: Research category for changes in pigmentation or uneven skin tone. The label does not establish that a finished product changes pigmentation.
Astringent: A technical role associated with tightening the skin surface.
Skin conditioning: A broad cosmetic role for maintaining skin condition. It does not identify a particular clinical benefit.

Function definitions: Original niacinamide study: Pigmentation and hyperpigmented spots ↗ · 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

Results are mixed. A 12-week, 5% gel trial in 23 women found no significant advantage over vehicle. Another 12-week trial analysed 100 adults using 5% tranexamic acid solution or 3% hydroquinone cream with daily sunscreen: both groups improved from baseline, without a significant difference between them.

What this does not tell us

The second trial had no vehicle-only group, lost 20 of 120 enrolled participants and compared different formulation types. It cannot establish equivalence to hydroquinone or overturn the negative vehicle comparison. These studies do not establish efficacy for every pigmentation concern or formula.

Sources for this summary. PubMed 22506692 ↗PubMed 31057273 ↗

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.