Isostearic Acid
AKA “Isooctadecanoic acid, 16-METHYLHEPTADECANOIC ACID, Heptadecanoic acid, UNII-LZM5XA0ILL, EINECS 220-336-3, 16-methylmargaric acid”
Synthetic
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Ingredient Facts
Isostearic acid
AKA: Isooctadecanoic acid, 16-METHYLHEPTADECANOIC ACID, Heptadecanoic acid, UNII-LZM5XA0ILL, EINECS 220-336-3, 16-methylmargaric acid
Synthetic · Binder | Cleanser | Emulsifier · EWG: 5
Plant-Derived
Emulsifier
Synthetic
Clean
A gentle binding agent that helps cleanse and blend formulas together, keeping products smooth and effective on skin.
Formula
C18H36O2
Mol. Weight
284.50
CAS #
30399-84-9, 2724-58-5
Form
Liquid
Plant-Derived
Botanical-Derived Synthetic. Derived from plant oils, particularly through selective hydrogenation of oleic acid and related fatty acids. Produced by hydrogenating unsaturated plant-based fatty acids to create a saturated, branched-chain structure.
Function
Binder | Cleanser | Emulsifier
Benefits
Holds Formula Together
Removes Impurities
Emulsifier
Cleansing Surfactant
Traditional Use
A synthetic branched fatty acid derived from petrochemical processes in the mid-20th century. Designed to mimic natural fatty acids while providing improved stability and emollient properties in skincare formulations.
Skin Types
all-skin-types
Best For
Target
Dryness
Melanin-Rich Skin
Suitable
Pregnancy Safe
Yes
Verified Feb 2026
Data: PubChem · CosIng · EWG · CIR