Nonoxynol-9
What is Nonoxynol-9?
Nonoxynol-9 is a synthetic nonionic surfactant chemically known as nonylphenol ethoxylated with nine units of ethylene oxide. Produced through ethoxylation of nonylphenol, it belongs to the alkylphenol ethoxylates family commonly used in rinse-off cosmetics like shampoos, body washes, and facial cleansers. In formulations, it functions by lowering the surface tension of liquids, which allows it to effectively lift dirt, excess sebum, and impurities from the skin. As an emulsifying agent, it stabilizes mixtures of oil and water, contributing to consistent textures in cleansing products. Its hydrophilic-lipophilic balance supports foaming and dispersion properties, making it suitable for products targeting oil removal without leaving residue. Primarily found in low concentrations in personal care items, it aids in creating effective yet gentle cleansing experiences.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Supports thorough cleansing by emulsifying oils and dirt for easy rinse-off.
Promotes foaming action in washes and shampoos for a satisfying lather.
Helps maintain product stability by blending water and oil phases evenly.
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 oily skin seeking effective oil-control cleansers. | Those with sensitive skin prone to irritation from surfactants. |
| Users of shampoos and body washes needing reliable foaming. | Individuals experiencing dryness, as it may strip natural moisture. |
| People preferring rinse-off products for daily hygiene routines. | Users preferring preservative-free or minimal-ingredient formulas. |
Safety Notes
- Rated moderate concern by EWG due to potential contamination risks.
- Formulated to be nonirritating in cosmetics per safety reviews.
Frequently Asked Questions about Nonoxynol-9
What does Nonoxynol-9 do in skincare?
It acts as a surfactant to cleanse by lowering surface tension and an emulsifier to mix oil and water stably.
Is Nonoxynol-9 comedogenic?
It has a comedogenic rating of 0, making it unlikely to clog pores.
Is it suitable for oily skin?
Yes, its oil-emulsifying properties make it good for oily skin types.