PEG-4
A humectant and solvent based on polyethylene glycol. It draws moisture and dissolves ingredients. Well tolerated.
Evidence by route
Topical application
A functional humectant and solvent. Safe.
- CIR Cosmetic Ingredient Review safety assessment
How to read tiers A–F
- BLimited evidence. One RCT or several controlled studies with limitations
Tolerability and safety
- Irritation potential
- Low
- Allergen risk
- Low
- Pregnancy
- Safe
- Suitable for
- Normal, Dry, Combination, Oily, Sensitive
About this ingredient
PEG-4 is a short-chain polyethylene glycol that acts as a humectant and solvent. It draws water into the surface layer of the skin and helps dissolve and blend other ingredients, which makes stable, even formulas easier. This is a functional ingredient. It gives light hydration and improves solubility, but it is not a corrective active: it does not treat wrinkles or pigment. Its value is in the base of the formula, as support that spreads and holds a little water. A known, reliable role in formulation. Applied topically there is no meaningful systemic absorption, so it can be used during pregnancy and breastfeeding. Tolerance is good: low irritation and allergy potential, suitable for sensitive skin. Short-chain PEGs rinse off well and do not clog pores; on very dry skin their humectant effect is light and pairs well with an occlusive.
Frequently asked questions
Is PEG-4 safe during pregnancy?
PEG-4 is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
What skin types is PEG-4 for?
PEG-4 suits: normal, dry, combination, oily, sensitive.
What is PEG-4 and what does it do in cosmetics?
A humectant and solvent based on polyethylene glycol.
What's the INCI name for PEG-4?
The INCI name is PEG-4.
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