The ingredient, explained

Betaine

Free betaine has been studied as an addition to irritating surfactant solutions. It is distinct from the surfactant cocamidopropyl betaine.

HumectantAntistaticHair conditioningSkin conditioningViscosity controlling

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Ingredient guide

What it is and what it does

Methanaminium, 1-carboxy-N,N,N-trimethyl-, hydroxide, inner salt

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

Humectant: Helps attract and retain moisture.
Antistatic: Reduces the build-up of static electrical charge on surfaces.
Hair conditioning: Improves cosmetic hair properties such as softness, shine or combability.
Skin conditioning: A broad cosmetic role for maintaining skin condition. It does not identify a particular clinical benefit.
Viscosity controlling: Adjusts how thick or fluid a product is.

Function definitions: 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 21 healthy volunteers, forearm patch tests of sodium lauryl sulfate and cocamidopropyl betaine caused less irritation when betaine was added. Researchers assessed visual reactions, water loss, electrical impedance and tissue changes.

What this does not tell us

This was a 24-hour experimental patch exposure, not a trial of routine face cleansing or a leave-on moisturiser. The abstract does not give concentrations or establish randomisation, so it cannot predict tolerability of another finished formula.

Sources for this summary. PubMed 12535285 ↗

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.