Emollient

PEG-10 Hydrogenated Castor Oil

INCI: PEG-10 HYDROGENATED CASTOR OIL

Reviewed by Kate · Last updated 18 Aug 2026

Also known as: Peg-10 Hydrogenated Castor Oil

A plant-derived emulsifier that helps bind water and oil in formulations

Best For Skin Types

All, Dry, Combination, Sensitive

Addresses

Dryness, Barrier repair

Usage Frequency

Daily

What Is PEG-10 Hydrogenated Castor Oil?

PEG-10 Hydrogenated Castor Oil is a synthetic ingredient derived from castor oil, which has been chemically modified through hydrogenation and polyethylene glycol (PEG) treatment. This process transforms the natural oil into a more stable, water-soluble compound suitable for cosmetic use.

In skincare formulations, it functions primarily as an emulsifier and emollient. Its role is to stabilise mixtures of water and oil-based ingredients that would otherwise separate, whilst also contributing a mild conditioning effect to the skin's surface.

How It Works

This ingredient works as an emulsifier by positioning itself at the boundary between water and oil phases in a formula. One end of its molecular structure is attracted to water, whilst the other is attracted to oil, allowing these incompatible phases to blend smoothly and remain stable rather than separating over time.

As an emollient, it deposits a light film on the skin surface that can help reduce transepidermal water loss and impart a softer feel, though it is considered less occlusive than heavier oils.

Clinical Evidence & References

PEG-10 Hydrogenated Castor Oil is widely used in cosmetics and is generally recognised as safe by regulatory bodies. However, specific clinical studies examining its efficacy or skin effects in isolation are limited in published literature.

Some users report concerns about potential fungal acne (Malassezia) sensitivity with polyethylene glycol derivatives, though evidence specifically linking this ingredient to fungal acne breakouts remains anecdotal. Those with documented fungal acne sensitivity may wish to patch test first or consult ingredient databases that track user reactions.

How to Use

This ingredient is typically used as part of a complete formulation rather than in isolation. When introducing products containing PEG-10 Hydrogenated Castor Oil, apply according to the product instructions. If you have sensitive skin or known sensitivities to PEG compounds, perform a patch test on a small area before full application. No additional usage guidance is needed beyond the product's own recommendations.

Safety & Precautions

Generally well-tolerated and recognised as safe in cosmetics. Those with known sensitivities to PEG compounds or a history of fungal acne may wish to proceed with caution and patch test first.

Frequently Asked Questions

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Part of a family

PEG-10 Hydrogenated Castor Oil is a variant of PEG-40 Hydrogenated Castor Oil, the form you will most often see on an ingredients list.

Acts as an emollient, emulsifying agent, and solubility-enhancing ingredient | Imparts a soft feel on skin and minimises moisture loss

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