Ingredient glossary
Propanediol
On your shelf ✓What Propanediol does for your skin, who it suits, and what to watch for.
INCI: Propanediol
In short: Propanediol delivers hydration and solvent, suits most skin types, and the evidence behind it is moderate.
- What it does
- Hydration, solvent
- Best for
- Most skin types
- Evidence
- Moderate
- How long
- Straight away
how it was measured
Measured on Corneometer stratum corneum hydration; on contact, by mechanism.
The molecule
The Glow take
Genuinely worth a spot in your routine.
When your goal is deep, lasting hydration, Propanediol pulls genuine weight, with a solid amount of evidence behind it. Gentle enough that most skin types can reach for it.
— Maya
What it does
- hydration
- solvent
moderate evidenceData from cosmetic use indicate propanediol is a well tolerated humectant/solvent with low sensitization and good compatibility in many formulas.
Why we say this
- CIR safety review Safety Assessment of Alkane Diols as Used in Cosmetics 2024
On a label: usually effective at 2-10%.
The glycol family, at a glance
5 glycol entries in the base, Propanediol among them. 4 of the 5 are a humectant.
Who it's for, and who should skip it
Tends to suit
- dry
- dehydrated
- all
Approach with care
No specific group flagged to avoid it.
- Clogs poresLow
- Irritation riskLow
How it fits each skin type
- DrySuits
- CombinationSuits
- OilySuits
- SensitiveSuits
Where it fits in your routine
This one works on contact — there is nothing to wait for.
What that covers, and what it does not
- Measured on: Corneometer stratum corneum hydration.
- 1,3-Propanediol is hygroscopic and acts at the skin surface by binding water in the stratum corneum, so the hydration reading moves on the first application rather than developing over visits; the bucket follows from that physics, not from a trial.
- No vehicle-controlled human study of propanediol alone reports a time course, and most published use is as a propylene-glycol replacement judged on tolerability and sensory grounds.
- Claims that it improves penetration of other actives are about the partner ingredient's timeline, not this one's.
Mechanism only; no single-ingredient human time-course study located.
Plays well with
- humectants
- emollients
Propanediol, answered
Is Propanediol safe during pregnancy?
Yes. Propanediol is considered safe to use during pregnancy and breastfeeding. As with anything, if you are unsure it is worth a quick word with your doctor or midwife.
Who should avoid Propanediol?
No specific group is flagged to avoid Propanediol. It is well tolerated by most skin. Still, introduce anything new one product at a time.
What concentration of Propanediol actually works?
Propanediol tends to do its job in the 2 to 10% range. Much lower and it is likely underdosed.
Compare Propanediol with
22 comparisons built, the 2 most looked-up above.
This, for every label you own
One ingredient is easy. A full label is where it gets confusing. The Ingredient Decoder reads any product and tells you the honest truth, ingredient by ingredient.
Sources & how we reviewed this
- CIR safety review Safety Assessment of Alkane Diols as Used in Cosmetics 2024summary page only, the document itself was not read
What changed on this page
- : what the EU regulates
- : sources
- : the PubChem record, light stability