Glycereth-25 PCA Isostearate

What is Glycereth-25 PCA Isostearate?

Glycereth-25 PCA Isostearate is a synthetic ingredient derived from glycerin ethoxylated with 25 ethylene oxide units, combined with pyrrolidone carboxylic acid (PCA, a humectant from amino acid metabolism) and isostearic acid (a branched-chain fatty acid from vegetable sources). It belongs to the class of ethoxylated esters used in cosmetics. Primarily found in moisturizers, lotions, and cleansing products, it functions as an emulsifier by lowering interfacial tension between oil and water phases, creating stable emulsions that prevent separation and ensure uniform consistency. Its skin-conditioning properties come from its ability to form a lightweight film that aids in product spreadability, enhancing sensory feel without greasiness. This dual role supports formulation efficacy in daily skincare routines.

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

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Skin conditioning agent
Maintains skin softness, smoothness, and flexibility.
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

Enhances skin softness and smoothness through conditioning action.

Stabilizes emulsions for consistent lotion and cream textures.

Promotes even product distribution on skin surfaces.

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 normal to dry skin needing mild conditioning.
People sensitive to ethoxylated compounds.
Users of emulsified products like daily moisturizers.
Individuals with known allergies to fatty acid esters.
Those preferring non-comedogenic ingredients in routines.
Those preferring completely natural or PEG-free formulations.

Safety Notes

  • Considered low hazard in cosmetic concentrations by safety assessments.
  • Non-comedogenic, suitable for acne-prone skin types.

Frequently Asked Questions about Glycereth-25 PCA Isostearate

What does Glycereth-25 PCA Isostearate do in products?

It emulsifies oils and water for stable creams while conditioning skin for softness.

Is it safe for sensitive skin?

Generally low irritation potential per safety data, but patch test recommended.

Does it cause breakouts?

Non-comedogenic rating indicates it does not clog pores.