Isosteareth-20

Benefits
Softening

What is Isosteareth-20?

Isosteareth-20 is a synthetic, nonionic surfactant produced by reacting isostearyl alcohol—a branched-chain fatty alcohol derived from isostearic acid in vegetable oils—with 20 units of ethylene oxide. This ethoxylation process enhances its water solubility and mildness. Primarily featured in skincare products such as lotions, creams, shampoos, body washes, and micellar waters, it operates by lowering surface tension between oil and water phases. This action forms stable emulsions, disperses oily ingredients evenly, and creates clear solutions for fragrances or actives, ensuring smooth textures, effective cleansing without stripping, and consistent product performance across various formulations.

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

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.
Emulsifying agent
Enables stable mixing of oil and water phases by forming an interfacial film, helping create lotions, creams, and cleansers with consistent texture.
Solubilizing agent
Helps incorporate oils and fragrance into water-based formulas by forming micro-solutions, enabling clear sprays, toners, and micellar products.

Benefits

Promotes skin softening for a smoother feel.

Stabilizes emulsions in creams and lotions for even application.

Aids in solubilizing oils and scents for clear, non-greasy formulas.

Who It's For

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

Who May Benefit Who Should Avoid
Individuals with dry skin seeking gentle softening effects.
People with rare allergies to ethoxylated ingredients.
Users of emulsion-based products like moisturizers and cleansers.
Those sensitive to nonionic surfactants in high concentrations.
Those preferring clear, stable formulations in toners or sprays.
Users preferring completely surfactant-free products.

Safety Notes

  • Rated low to moderate hazard (1-3) by EWG assessments.
  • Non-comedogenic with zero rating for pore-clogging potential.

Frequently Asked Questions about Isosteareth-20

What does Isosteareth-20 do in skincare?

It acts as a surfactant, emulsifier, and solubilizer to blend oils with water, stabilize products, and soften skin.

Is Isosteareth-20 safe for daily use?

Yes, it's considered low hazard by EWG (1-3) and non-comedogenic, suitable for most in typical formulas.

Does it cause irritation?

Evidence points to low irritation potential as a nonionic surfactant in cosmetics.