Other
PEG-5 PHYTOSTEROL
Safety score · 0–100
Good
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A plant-derived emulsifier that combines phytosterols with a short PEG chain — helps stabilise formulations while delivering cholesterol-like barrier benefits to skin.
PEG-5 Phytosterol is the polyethylene glycol ether of beta-sitosterol (a plant sterol) with 5 moles of ethylene oxide. It functions as an emulsifier and skin-conditioning agent. Phytosterols are structural analogues of cholesterol, a key component of the skin's lipid barrier, making this ingredient particularly beneficial for barrier-repair formulations. The short PEG chain provides water solubility while maintaining the sterol's skin-affinity. CIR reviews of phytosterol ingredients support their safety. Low degree of ethoxylation minimises 1,4-dioxane concerns.
Skin benefits
- Barrier repair and reinforcement
- Cholesterol-analogue skin conditioning
- Emulsification
- Anti-inflammatory phytosterol benefits
Known concerns
- Potential trace 1,4-dioxane from ethoxylation (minimal at 5 EO)
- Plant sterol source may be from soy — relevant for soy-allergic individuals
References
EU CosIng database
European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.