Rate My SPF

PEG-40 Castor Oil

What PEG-40 Castor Oil is & what it does

PEG-40 Castor Oil is a nonionic surfactant made by reacting castor oil with about 40 units of ethylene oxide (PEGylation). In skincare and sunscreen formulas it works as an emulsifier and solubilizer, helping disperse oils, fragrances, and UV filters evenly into water-based products. It is valued for its mildness and its ability to stabilize emulsions and clear, fragranced liquids.

What does PEG-40 Castor Oil do in skincare?

PEG-40 Castor Oil acts as an emulsifier and solubilizer. It helps blend oils, fragrances, and UV filters into water-based products so the formula stays clear and stable. You will often find it in cleansers, lotions, and sunscreens for this reason.

Is PEG-40 Castor Oil safe?

PEG-40 Castor Oil is widely used in cosmetics as a mild surfactant and is generally considered well tolerated at the levels used in skincare. Some people with very sensitive skin may prefer to patch test, as with any new product. If you have a specific concern, it is best to consult a professional.

Is PEG-40 Castor Oil vegan?

PEG-40 Castor Oil is derived from castor oil, which comes from the castor bean plant, so the base material is plant-derived rather than animal-derived. Whether a finished product is fully vegan depends on its other ingredients and the brand's practices. Check the product label or brand for a vegan claim if that matters to you.

Sunscreens with PEG-40 Castor Oil

We rate 12 sunscreens that contain it, showing the top 10 by overall score:

← All ingredients