Isoceteth-25

What is Isoceteth-25?

Isoceteth-25 is a synthetic polyoxyethylene ether made by reacting isocetyl alcohol, a branched-chain fatty alcohol, with 25 units of ethylene oxide. This ethoxylation process creates a hydrophilic head and lipophilic tail, making it an effective non-ionic surfactant. In cosmetics, it appears in rinse-off products like shampoos, shower gels, facial cleansers, and leave-on items such as lotions and creams. It functions by reducing surface tension to lift soils and oils, promoting foam formation, and forming micellar structures for dirt dispersion. As an emulsifier, it stabilizes blends of immiscible oil and water phases through interfacial tension reduction, ensuring uniform texture and preventing separation during storage or use. Its branched structure enhances mildness and solubility over straight-chain alternatives.

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.

Benefits

Supports gentle removal of impurities and excess oils in cleansers.

Helps maintain stable, smooth textures in lotions and creams.

Promotes light foaming for refreshing wash-off experiences.

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 daily cleansers needing mild surfactant action.
Those with sensitivity to ethoxylated alcohols.
People with combination or oily skin preferring non-comedogenic options.
People preferring formulations without synthetic surfactants.
Individuals using emulsified moisturizers for consistent application.
Individuals experiencing irritation from similar non-ionic emulsifiers.

Safety Notes

  • Considered safe for cosmetic use with low overall hazard ratings.
  • Shows minimal skin and eye irritation in standard assessments.

Frequently Asked Questions about Isoceteth-25

What does Isoceteth-25 do in products?

It acts as a surfactant to cleanse and foam, plus emulsifies for stable oil-water blends.

Is Isoceteth-25 comedogenic?

It has a comedogenic rating of zero, making it unlikely to clog pores.

How safe is Isoceteth-25 for skin?

Safety profiles indicate low hazard and minimal irritation for typical cosmetic levels.