Hydrogenated Castor Oil
Reviewed by Daisy · Last updated 18 Aug 2026
Also known as: Castor Oil, Acetylated Castor Oil, PEG-40 Hydrogenated Castor Oil, PEG-60 Hydrogenated Castor Oil, Ricinus Communis (Castor) Seed Oil, Ricinoleate, Surfactant
Hydrogenated form of castor oil | Hard, waxy substance
Addresses
EWG Safety Score
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What Is Hydrogenated Castor Oil?
Hydrogenated castor oil is the oil extracted from castor (Ricinus communis) beans that has gone through the process of hydrogenation, which is adding hydrogen to a non-hydrogen compound. The result is the transformation of the original oil to a hard, waxy substance.
In cosmetics, hydrogenated castor oil serves many functions, including as an emollient, surfactant, occlusive and skin-conditioning ingredient. Its occlusive properties help preserve skin’s water content, thus aiding in moisturization.
The independent Cosmetic Ingredient Review panel has found it safe as used in cosmetics.
Hydrogenated castor oil is used in amounts ranging from 0.0003–39%. The largest concentration of usage is in eyeliners since it helps such products maintain a hard consistency that still applies smoothly.
Benefits for Your Skin
Clinical Evidence & References
Published Research
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Acme Hardesty, Accessed March 2023, Website [https://www.acme-hardesty.com/product/hydrogenated-castor-oil/]
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SpecialChem, Accessed March 2023, Website [https://www.specialchem.com/cosmetics/inci-ingredients/hydrogenated-castor-oil]
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International Journal of Toxicology, May 2007, pages 31–77 [https://journals.sagepub.com/doi/10.1080/10915810701663150]
From the Clinic
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Glycol Stearate Se
A gentle emulsifier that helps bind water and oil in skincare formulations
Grape Seed Oil Polyglyceryl-6 Esters
A plant-derived cleansing agent that removes oil-based impurities whilst conditioning the skin
Hippophae Rhamnoides Acid
A plant-derived acid that conditions skin and helps stabilise formulations
Hydrogenated Coconut Acid
A saturated fatty acid derived from coconut oil, functioning as emollient and emulsifier
Hydrogenated Dimer Dilinoleyl/Dimethylcarbonate Copolymer
A polymer that stabilises emulsions and supports skin's protective barrier
Hydrogenated Lecithin
Functions as a skin-conditioning emollient | Can enhance the penetration of other ingredients
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