EWG Safety Score
What Is Castor Isostearate Succinate?
Castor isostearate succinate is a mix of esters formed by the reaction of castor seed oil, isostearic acid, and succinic acid. This ingredient functions as a skin conditioning agent and is primarily used as an emollient or lubricant in hair or lip care products.\n\nAccording to one of its suppliers, it can also help boost SPF in skin care products. In its raw form, castor isostearate succinate is a clear to slightly hazy amber liquid. The independent Cosmetic Ingredient review board has ruled it safe as used in cosmetics. Typical usage levels range from 0.25%–10%, depending on desired formulary characteristics.
Benefits for Your Skin
Clinical Evidence & References
Published Research
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International Journal of Toxicology, August 2014 [URL not available on page] International Journal of Toxicology, 2014
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Surfactants in Personal Care Products and Decorative Cosmetics, 3rd Edition, CRC Press, Taylor & Francis Group, LLC 2007, page 374 [URL not available on page] Surfactants in Personal Care Products and Decorative Cosmetics, 2007
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