Polyether-1
INCI: POLYETHER-1
Reviewed by Emma · Last updated 2 Jun 2026
A viscosity modifier that helps formulations achieve the right texture and stability
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What Is Polyether-1?
Polyether-1 is a synthetic polymer used in skincare formulations as a viscosity controlling agent. Its primary role is to adjust the thickness and flow properties of a product, helping to create a stable, consistent texture that feels pleasant on the skin.
This ingredient works behind the scenes to improve the cosmetic appeal and usability of a formulation rather than delivering direct skincare benefits itself. It is present in a small proportion of skincare products, typically at very low concentrations.
How It Works
Polyether-1 functions as a thickening or thinning agent depending on how it is used in a formulation. By modifying the viscosity of the base product, it allows formulators to achieve the desired consistency—whether that is a lightweight serum, a flowing lotion, or a richer cream.
The ingredient does not penetrate the skin or alter skin biology directly. Instead, it ensures that active ingredients and other beneficial components are delivered in a formulation that is stable, easy to dispense, and pleasant to use.
Clinical Evidence & References
Research on polyether compounds in cosmetic applications is limited. The ingredient's primary purpose—viscosity control—is a functional property rather than a therapeutic one, so clinical studies typically focus on formulation performance and stability rather than direct skin benefits.
There is no evidence to suggest that polyether-1 causes irritation or harm when used in cosmetic products at approved concentrations, and it is generally recognised as safe by cosmetic regulators.
How to Use
Polyether-1 is not an active ingredient that requires specific application guidance. It will be part of your chosen formulation, so follow the usage instructions provided by the product manufacturer. There is no need to adjust how you use a product based on this ingredient alone.
Safety & Precautions
Frequently Asked Questions
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