EWG Safety Score
What Is Bentonite?
Bentonite is a type of natural clay that is most famously used as an oil-absorbing agent in facial masks and other cosmetics. While its absorbent properties are helpful for those with oily skin, it can be drying for other skin types (especially when used in very high amounts). To overcome this, some formulators pair bentonite with hydrating/soothing ingredients. These work to limit the absorbency of bentonite while still allowing skin to benefit without becoming dried out. Other reported functions of bentonite in cosmetics include bulking agent/thickener, emulsion stabilizer, opacifying agent, and suspending agent.
Raw bentonite is derived from the alteration of volcanic ash and is mainly composed of the minerals montmorillonite and illite. It undergoes a purification process before being sold as a cosmetic ingredient and has a long history of safe use. Further backing bentonite's safety, it is generally recognized as safe (also known as GRAS status) by the US FDA as a direct food additive.
Benefits for Your Skin
Clinical Evidence & References
Published Research
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BMC Chemistry, September 2021, pages 1-11 BMC Chemistry, 2021
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SN Applied Sciences, May 2019, pages 1-13 SN Applied Sciences, 2019
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Journal of pharmaceutical investigation, May 2016, pages 363–375 Journal of pharmaceutical investigation, 2016
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International Journal of Toxicology, March 2003, pages 37-102 International Journal of Toxicology, 2003
Frequently Asked Questions
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Take the skin quizOther forms of Bentonite
These appear on ingredients lists under different names but are the same substance. Bentonite is the common form.
Related Ingredients
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Volcanic clay for deep cleansing and detox
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