Mid-weight polyethylene glycol – a humectant solvent and solubilizer. Helps blend water- and oil-soluble components and softens the texture. Pregnancy-safe.
Topical application
BLimited evidence. One RCT or several controlled studies with limitations.
Functional PEG solubilizer. Safety confirmed by CIR and pharmacopoeia.
PEG-8 is polyethylene glycol with a molecular weight around 400 (8 ethylene oxide units). INCI: PEG-8 or Polyethylene Glycol 400. A colorless viscous liquid that dissolves well in water. In pharmacology it is used as Macrogol-400. In cosmetics it works as a solubilizer, humectant and texture modifier: it holds water in the formula, helps dissolve solid and crystalline actives, and makes the texture more slippery. Use levels run from 1 to 10%. It is usually part of the water phase in creams, serums and micellar waters. Pregnancy safety. Skin absorption into the systemic circulation is minimal; oral PEG-400 (Macrogol) is approved during pregnancy as an osmotic laxative. CIR rates the safety profile as acceptable. Skin profile. Low irritation and allergen potential. Non-comedogenic. Suitable for all skin types. On severely damaged skin PEG components could in theory increase the absorption of other substances – but this matters only for medicated formulations, not household cosmetics. No active effects.
Irritation potential
LowAllergen risk
LowPregnancy
SafeSuitable for
PEG-8 is considered safe during pregnancy at typical cosmetic concentrations. Systemic absorption through the skin is minimal.
PEG-8 suits: normal, dry, combination, oily, sensitive.
Mid-weight polyethylene glycol – a humectant solvent and solubilizer.
On the Fulton scale 0/5 – non-comedogenic. For acne-prone skin, a rating of 3 or higher suggests choosing an alternative.
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