The ingredient, explained

Glycerin

Also called glycerol, this water-binding ingredient has been studied in creams for hydration and dry, eczema-prone skin.

HumectantDenaturantHair conditioningOral carePerfumingSkin protectingViscosity controlling

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Ingredient guide

What it is and what it does

Glycerin, also called glycerol, is a humectant. That means it helps attract and retain moisture. Its registry also lists roles in conditioning and controlling the formula's thickness.

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

Humectant: Helps attract and retain moisture.
Denaturant: Makes a product unpalatable, often in alcohol-containing formulas.
Hair conditioning: Improves cosmetic hair properties such as softness, shine or combability.
Oral care: Supports cosmetic functions in the mouth, such as cleaning or deodorising.
Perfuming: A formulation role for perfume and aromatic raw materials that give a product its scent.
Skin protecting: A technical role associated with protecting skin from external factors.
Viscosity controlling: Adjusts how thick or fluid a product is.

Function definitions: European Commission ingredient function definitions (SCCNFP/0299/00, pages 16 to 20) ↗ · Danish Environmental Protection Agency: Cosmetic fragrance functions ↗

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

A study in 26 volunteers measured increased moisture after a glycerol-based cream. In a 197-patient trial, 20% glycerin and a urea-saline cream had comparable dryness outcomes, with less smarting reported for glycerin. A separate 109-patient trial found better dryness and water-loss results with the urea-saline cream.

What this does not tell us

The results depend on the complete cream and outcome measured. In the 109-patient trial, glycerin did not reduce water loss more than its base. These findings do not mean every glycerin-containing product repairs the skin barrier.

Sources for this summary. PubMed 16679823 ↗PubMed 12013198 ↗PubMed 11737814 ↗

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.