Researched by Helena DeMaria-Williams
Formula IngredientEmulsifierPeg-40 Hydrogenated Castor Oil
INCI: PEG-40 Hydrogenated Castor Oil
PEG-40 Hydrogenated Castor Oil is a polyethylene glycol (PEG) derivative of hydrogenated castor oil, produced by reacting castor oil with ethylene oxide. It is a mildly viscous, amber-coloured liquid that functions primarily as an emulsifier and surfactant, allowing oil and water-based ingredients to blend stably in a formulation. It is also widely used as a fragrance solubiliser in water-based products, enabling fragrance compounds to disperse evenly without separation.
Category
Emulsifier
Irritation Risk
Low
Skin Types
all skin types, oily, dry, combination, sensitive, acne-prone
What does this do in a formula?
emulsification, fragrance solubilisation, formulation stability, gentle cleansing
Is Peg-40 Hydrogenated Castor Oil safe? Key considerations
Can Peg-40 Hydrogenated Castor Oil cause irritation?
Low RiskThe Cosmetic Ingredient Review (CIR) has assessed PEG-40 Hydrogenated Castor Oil as safe at concentrations up to 100% without causing direct irritation on healthy, intact skin. However, it can increase the skin penetration and sensitisation potential of other co-formulated ingredients. The Cosmetics Database assigns a moderate hazard rating primarily due to contamination concerns — PEG compounds can contain trace impurities such as ethylene oxide and 1,4-dioxane depending on manufacturing quality. No EU CosIng Annex II or III restrictions apply.
Does Peg-40 Hydrogenated Castor Oil increase sun sensitivity?
No RiskPEG-40 Hydrogenated Castor Oil does not increase photosensitivity. No sun protection precautions are required based on its presence in a formulation.
Is Peg-40 Hydrogenated Castor Oil safe during pregnancy?
CautionPEG compounds can contain trace impurities including 1,4-dioxane, which is classified as a possible human carcinogen (IARC Group 2B), and ethylene oxide. Exposure from leave-on cosmetics at typical concentrations is considered very low risk, but some sources advise caution during pregnancy as a precautionary measure. Rinse-off formulations pose minimal concern. Consult a healthcare provider if in doubt.
How does Peg-40 Hydrogenated Castor Oil work?
PEG-40 Hydrogenated Castor Oil is a polyethylene glycol (PEG) derivative of hydrogenated castor oil, produced by reacting castor oil with ethylene oxide. It is a mildly viscous, amber-coloured liquid that functions primarily as an emulsifier and surfactant, allowing oil and water-based ingredients to blend stably in a formulation. It is also widely used as a fragrance solubiliser in water-based products, enabling fragrance compounds to disperse evenly without separation.
Individuals with broken or damaged skin, known PEG sensitivity or allergy should review the considerations above before use.
Which products contain Peg-40 Hydrogenated Castor Oil?
Shop products that contain Peg-40 Hydrogenated Castor Oil
15% Vitamin C + EGF Serum
Glycolic Acid Toner
PHA Toner
PRO Redness Prone Skin Cleansing Facial Wash
Matrixyl 10% + HA
Multi-Peptide + HA Serum
