Polyhydroxystearic Acid

Polyhydroxystearic Acid molecular structure
molecular structure · PubChem
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Plant-Derived
Cleanser
Emulsifier
Acid
Clean
OriginDerived from stearic acid, a naturally occurring fatty acid found in plant and animal oils. Produced through catalytic hydrogenation and hydroxylation of stearic acid to introduce hydroxyl groups.
12-Hydroxyoctadecanoic acid, homopolymer
Family
Not applicable – Synthetic ingredient
CAS #
27924-99-8, 58128-22-6
Form
Liquid
Skin Types
●all-skin-types, gentle
Best For
General
Pregnancy & Breastfeeding Safe
Yes
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Emulsifier
Mixes Oil & Water
The paper trail
🔬Peer-reviewed1 paper →
⚖️Regulatory1 listing →
🛡️Safety-assessed2 reviews →
Counts, not a verdict. A listing isn't a study. The trail, you decide.
EWG
1
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Skin Irritant
2 studies / 2 not irritating (CIR 846)
Not a Sensitizer
2 studies / 2 not sensitizing (CIR 846)
Not an Eye Irritant
1 study / 1 not irritating (CIR 846)
Concentration Guide
Leave-on0.014–14.2%
Rinse-offNot reported
0%50%100%
CIR reported use · report published 2026
Regulatory Status
USA✔ permitted
EU⚠ restricted
JAPAN⚠ restricted
CANADA⚠ restricted
Verified Jun 2026
Data: CosIng · EWG · CIR