The ingredient, explained
Propanediol
A published expert assessment examines cosmetic-use safety.
Ingredient guide
What it is and what it does
1‚3-dihydroxypropane
About this ingredient: EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗
- Viscosity controlling
- Adjusts how thick or fluid a product is.
- Solvent
- Dissolves other ingredients in a formula.
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
Safety assessment
Propanediol is included among the seven alkane diols supported for the cosmetic uses and concentrations described.
What this does not tell us
The report reached insufficient-data conclusions for three different diols. Its conclusions must not be transferred between isomers or treated as efficacy evidence.
Sources for this summary. PubMed 38174390 ↗
Research review checked Oct 1, 2026
Bounded review of 42 local candidate records, selected relevant abstracts, and targeted exact-name primary-source searches. Not a systematic review.
Ingredient research is not proof that a product containing this ingredient works.
Read the 1 selected study
Safety assessment
Safety Assessment of Alkane Diols as Used in Cosmetics. ↗
International journal of toxicology · 2024
Follow the formula
Products containing this ingredient
From the Serenfold edit. Linked by the ingredient list, without an efficacy ranking.
Names and identifiers
Registry identity
1‚3-dihydroxypropane
- INCI name on ingredient lists
- PROPANEDIOL
- CAS registry number
- 504-63-2, 26264-14-2
- EC number
- 207-997-3
Sources for this ingredient record
- EU CosIng ingredient registry (via Open Beauty Facts taxonomy) ↗ · ODbL 1.0 (Open Beauty Facts database) · Recorded Aug 8, 2026