1,5-Pentanediol

AKA: Pentane-1, 5-diol, 111-29-5, 5-Dihydroxypentane, Pentamethylene glycol, 5-Pentamethylene glycol, 5-Pentylene glycol, Alpha, Omega-Pentanediol
Synthetic
Humectant
Solvent
Synthetic
Clean
Pentane-1,5-diol is a primary alcohol.
Solubility Miscible with water
Formula
C5H12O2
Mol. Weight
104.15
CAS #
111-29-5
Form
Liquid
State
Liquid
Functions
Humectant
A moisture magnet. Pulls water from the air and deeper skin layers up to the surface to keep skin plump and hydrated.
Solvent
Dissolves other ingredients so they distribute evenly in the formula. Often the invisible "base" everything else is mixed into.
Dissolves Ingredients
Dissolves other ingredients
Traditional Use
A synthetic hydrocarbon solvent developed in the 20th century for industrial and cosmetic applications. Used as a volatile carrier in personal care products to aid ingredient penetration and product spreadability.
EWG
1
CIR
Insufficient
Pregnancy
CIR Safety Findings
all-shades-safe
Moderate Irritant
Regulatory Status
USAunder review
EUrestricted
JAPANrestricted
CANADArestricted
Skin Types
all-skin-types
Best For
General
The paper trail
🔬Peer-reviewed1 paper
⚖️Regulatory0 listings
🛡️Safety-assessed2 reviews
Counts, not a verdict. A listing isn't a study. The trail, you decide.
Verified Jun 2026
Data: PubChem · CosIng · EWG · CIR