Propanediol ●
TL;DR. It primarily acts as a solvent and humectant, helping dissolve actives, improve spread, and support water retention in skin and hair formulas. It can also boost preservative systems and reduce tack compared with some heavier polyols.
What does Propanediol do in a cosmetic formula?
It primarily acts as a solvent and humectant, helping dissolve actives, improve spread, and support water retention in skin and hair formulas. It can also boost preservative systems and reduce tack compared with some heavier polyols.
Is Propanediol clean?
From a clean beauty perspective, this ingredient is generally well-tolerated, low-odor, and not a common allergen or sensitizer. It has broad acceptance in modern clean standards when purity and sourcing are well documented.
Is Propanediol sustainable?
This material is commonly made by fermentation of renewable plant sugars, though petrochemical routes also exist. It is readily biodegradable and does not raise major persistence or bioaccumulation concerns.
Is Propanediol COSMOS-approved?
It is permitted under COSMOS-natural and COSMOS-organic when produced from approved renewable feedstocks and compliant processing. Its fit with Green Chemistry is strong when fermentation-derived, with renewable input, good biodegradability, and utility as a lower-concern solvent.
How does Propanediol work chemically?
The molecule is a small three-carbon diol with two hydroxyl groups, which explains its water miscibility, humectancy, and solvent behavior. Typical use levels are about 1 to 10 percent, sometimes higher in water-based systems, and it is generally stable across normal cosmetic pH ranges.
Last updated 2026-05-13