Magnesium Oleth Sulfate
AKA “Magnesium oleth sulfate”
Surfactant
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Ingredient Facts
Magnesium oleth sulfate
Surfactant · Cleansing · EWG: 2
Synthetic
Cleanser
Clean
Poly(oxy-1,2-ethanediyl), .alpha.-sulfo-.omega.-(9-(Z)-octadecenyl)oxy-, magnesium salts (2:1) (1-4 mol EO average molar ratio)
CAS #
87569-97-9
Form
Powder
See origin →
Functions
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Cleansing
Makes oil and water mix so dirt, makeup, and sunscreen can actually be washed away. The reason your face wash foams.
Surfactant Cleansing
Anti-Inflammatory
Fights Acne
Antioxidant
Removes dirt and impurities
Lifts away dirt and oil
Traditional Use
A modern surfactant developed in the latter half of the 20th century from oleic acid derivatives. Created to improve cleansing performance and stability in personal care products.
Skin Types
●all-skin-types
Best For
General
Pregnancy & Breastfeeding Safe
Yes
EWG
2
CIR
Safe as used
Pregnancy
Yes
CIR Safety Findings
Not a Sensitizer
medical-approval
all-shades-safe
Regulatory Agencies
Verified Jun 2026
Data: CosIng · EWG · CIR