Oleth-3

What is Oleth-3?

Oleth-3 is a polyethylene glycol ether of oleyl alcohol, specifically polyoxyethylene (3) oleyl ether, produced by ethoxylating oleyl alcohol—a fatty alcohol derived from vegetable oils—with three units of ethylene oxide. This synthetic ingredient belongs to the class of PEG ethers widely used in rinse-off and leave-on cosmetics, particularly in cleansing products, hair care, and emulsified formulations such as lotions and creams. It works by lowering surface tension between oil and water phases, forming micelles that stabilize emulsions and enable the dispersion of hydrophobic materials like oils and fragrances into aqueous systems. As a surfactant, it facilitates dirt removal during cleansing; as an emulsifier, it prevents phase separation for uniform product texture; and in fragranced items, it enhances scent solubility without altering the formula's clarity or stability.

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

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
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

Enables smooth blending of oils and water for consistent lotion and cream textures.

Solubilizes fragrances to deliver even scent distribution in watery products.

Supports effective yet mild cleansing action in shampoos and washes.

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 hydrating emulsions.
Those with oily skin due to potential pore-clogging.
Users of normal skin types in daily cleansers.
Acne-prone individuals sensitive to high comedogenic ingredients.
People preferring scented hair and body products.
Users avoiding ethoxylated compounds in routines.

Safety Notes

  • Rated low to moderate concern by EWG based on use levels.
  • Reviewed safe for cosmetic use by Cosmetic Ingredient Review experts.

Frequently Asked Questions about Oleth-3

What does Oleth-3 do in products?

It acts as a surfactant for cleansing, emulsifier for stability, and fragrance solubilizer.

Is Oleth-3 safe for skin?

Generally low hazard per EWG and safe per reviews at common levels.

Who should skip Oleth-3?

Oily or acne-prone skin due to comedogenic potential.