PEG-40 Stearate

PEG / Ethoxylated
Benefits
Cleansing
Concerns
Malassezia Feeding

What is PEG-40 Stearate?

PEG-40 Stearate is a non-ionic surfactant created by esterifying stearic acid—a saturated fatty acid sourced from palm, coconut, or tallow—with polyethylene glycol featuring 40 ethylene oxide units. This ethoxylation imparts water solubility and dual-affinity for oil and water. Primarily used in rinse-off cleansers, shampoos, and leave-on emulsions like lotions and creams, it functions by reducing interfacial tension to form stable oil-in-water mixtures, preventing phase separation for consistent product texture. It also disperses lipophilic components such as fragrances and oils into watery bases, supporting transparent micellar waters and sprays. As a cleansing aid, it generates micelles that encapsulate and rinse away soils without harsh stripping.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1-3 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Surfactant
Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.
Cleansing agent
Removes dirt, oil, and impurities by lowering surface tension and forming micelles, enabling soils to be lifted and rinsed away from skin, hair, or teeth.
Solubilizing agent
Helps incorporate oils and fragrance into water-based formulas by forming micro-solutions, enabling clear sprays, toners, and micellar products.

Benefits

Enables effective cleansing by lifting dirt and excess oil from skin and hair.

Stabilizes lotions and creams for even application and lasting emulsion.

Solubilizes fragrances and oils for clear, non-cloudy water-based products.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Users of shampoos, body washes, and facial cleansers seeking thorough yet gentle removal of impurities.
Those prone to Malassezia-related conditions like fungal acne.
Individuals applying lotions or conditioners that require smooth, non-separating textures.
Individuals sensitive to ethoxylated ingredients or preferring clean-label formulas.
People formulating or using toners and sprays with essential oils or scents.
Users avoiding potential trace contaminants common in PEG compounds.

Safety Notes

  • Cosmetic Ingredient Review experts affirm its safety in typical cosmetic concentrations for rinse-off and leave-on uses.
  • EWG scores range from 1-3, indicating low to moderate overall hazard potential.

Frequently Asked Questions about PEG-40 Stearate

What does PEG-40 Stearate do in products?

It acts as a surfactant for cleansing, emulsifier for stable creams, and solubilizer for oils in water.

Is PEG-40 Stearate safe for daily use?

Yes, regulatory reviews confirm safety in cosmetics at standard levels.

Does it contribute to fungal acne?

It may feed Malassezia, so caution advised for those susceptible.