Polyhydroxystearic Acid
AKA “Polyhydroxystearic Acid”
Synthetic
Ingredient Facts
Polyhydroxystearic acid
Synthetic · Emollient · EWG: 1
Plant-Derived
Emollient
Cleanser
Emulsifier
Skin Conditioner
Synthetic
Clean
Helps blend oil and water-based ingredients together, creating a smooth, stable texture that applies evenly on skin.
Family
Not applicable – Synthetic ingredient
CAS #
27924-99-8, 58128-22-6
Form
Liquid
See origin →
Functions
Emulsifying
Forces oil and water to stay mixed instead of separating into layers. The unsung hero holding your lotion together.
Emollient
Fills in the tiny cracks between skin cells to make everything feel smooth and soft. The "silky finish" ingredient.
Skin Conditioning
A catch-all term for ingredients that improve how skin looks and feels — softer, smoother, more supple. The workhorse behind most moisturizers.
Emulsifier
Mixes Oil & Water
Traditional Use
A synthetic derivative of stearic acid created to improve the texture and spreadability of cosmetic formulations; developed as part of modern chemistry advances to enhance product feel without traditional animal-derived stearic acid.
Skin Types
●all-skin-types, gentle
Best For
General
Melanin-Rich Skin
Suitable
Pregnancy & Breastfeeding Safe
Yes
Barrier Repair Cream
Alpyn Beauty
Mini Barrier Repair Cream
Alpyn Beauty
Glossybounce™
Saie
Glossybounce™ Duo
Saie
Lip Combo
Saie
Glossybounce™ Duo
Saie
Original Liplux® Lip Balm Sunscreen
COOLA
Clear Skin Oil-Free Moisturizer
COOLA
Rosilliance® Tinted Moisturizer - Fresh Rose
COOLA
Rosilliance® Tinted Moisturizer - Golden Hour
COOLA
Bioidentical Collagen Serum
Josh Rosebrook
The Body Essentials Mini
Nécessaire
The Lip Balm Duo
Nécessaire
The Body Essentials
Nécessaire
COLORFREE ZINC Broad Spectrum Sunscreen | SPF 32
Marie Veronique
SuperSEA Firming & Lifting Treatment
True Botanicals
Wet Stick
Kosas
Revealer Extra Bright
Kosas
Plump + Juicy Cleansing Oil
Kosas
DreamBeam SPF 40 PA++++
Kosas
SOS FaceGuard™ SPF 30 Sunscreen PA+++
Tower 28 Beauty
COLORFREE Zinc Broad Spectrum Sunscreen SPF 32
Credo Beauty
Mineral Sunscreen
Credo Beauty
The Body Essentials
Credo Beauty
The Deodorant | Mandelic Acid
Nécessaire
Pure Radiance Overnight Lip Treatment
Credo Beauty
Radiant Repair Night Ritual
True Botanicals
Lip Wrap Overnight Mask
Credo Beauty
Tinted Skincare Lineup with BB Burst
Credo Beauty
Super Serum Skin Tint SPF 30
ILIA Beauty
Soft Matte Lipstick Last Call
MOB Beauty
Blurring Blot Balm & Primer
MOB Beauty
Frost Lipstick
MOB Beauty
Soft Matte Lipstick
MOB Beauty
Hydrating Shine Lip Balm
MOB Beauty
Deluxe Baby Cheeks Blush Stick - Bichette
Westman Atelier
Petite Petal Edition
Westman Atelier
Lip Suede Matte Lipstick - Figue
Westman Atelier
Lip Suede Matte Lipstick - Pinch
Westman Atelier
Lip Suede Matte Lipstick - Rose
Westman Atelier
Lip Suede Matte Lipstick - Reine
Westman Atelier
Lip Suede Matte Lipstick - Mimi
Westman Atelier
Deluxe Baby Cheeks Blush Stick
Westman Atelier
Lip Suede Matte Lipstick - Petal
Westman Atelier
Lip Suede Matte Lipstick - Rue
Westman Atelier
Lip Suede Matte Lipstick - Ma Biche
Westman Atelier
Lip Suede Matte Lipstick - LFG
Westman Atelier
Lip Suede Matte Lipstick - Lou Lou
Westman Atelier
Lip Suede Matte Lipstick - Le Rouge
Westman Atelier
Lip Suede Matte Lipstick - Minx
Westman Atelier
Verified Feb 2026
Data: CosIng · EWG · CIR