PEG-20 Soy Sterol
What is PEG-20 Soy Sterol?
PEG-20 Soy Sterol is a synthetic derivative of natural soy sterols, primarily phytosterols like beta-sitosterol extracted from soybeans. It undergoes ethoxylation, where 20 molecules of ethylene oxide attach to the sterol, enhancing its solubility in water and ability to interact with oils. This chemical modification creates a nonionic surfactant commonly used in rinse-off products such as shampoos, body washes, and facial cleansers, as well as leave-on items like moisturizers and sunscreens. In formulations, it reduces surface tension at the oil-water interface, enabling effective emulsification to prevent phase separation and maintain smooth textures. It also supports micelle formation for gentle dirt and oil removal during cleansing without stripping the skin barrier excessively. Its plant-based origin appeals to formulators seeking hybrid natural-synthetic ingredients for broad compatibility in personal care products.
Roles in Formulation
This ingredient serves the following purposes in cosmetic formulations:
Benefits
Facilitates stable blending of oil and water in creams and lotions for even application.
Enhances foaming and cleansing action in shampoos and washes.
Supports non-comedogenic formulas suitable for everyday use.
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 using emulsified moisturizers for consistent hydration. | Those with known sensitivity to polyethylene glycol compounds. |
| People with oily skin preferring gentle, non-pore-clogging cleansers. | Individuals preferring fully non-ethoxylated ingredients. |
| Users of shampoos seeking effective yet mild surfactant action. | People with soy allergies, though processing minimizes protein risks. |
Safety Notes
- Assessed as safe for cosmetic use by the Cosmetic Ingredient Review, with typical low concentrations.
- Potential contamination with ethylene oxide or 1,4-dioxane requires good manufacturing practices.
Frequently Asked Questions about PEG-20 Soy Sterol
What is PEG-20 Soy Sterol made from?
It derives from soy sterols, plant compounds from soybeans, chemically modified by adding polyethylene glycol chains for better water solubility.
Is PEG-20 Soy Sterol comedogenic?
It carries a comedogenic rating of 0, indicating low likelihood of pore clogging.
What roles does it play in products?
Primarily acts as a surfactant for cleansing and foaming, and an emulsifying agent for mixing oil and water phases.