Quick answer
Clay derived from volcanic ash (which is purified before becoming a cosmetic ingredient); Most famously used as an oil-absorbing agent in facial masks; Also functions as a thickener, emulsion stabilizer, and opacifying agent in cosmetic formulas; Helpful for oily skin but can be drying for other skin types (when used in high amounts) Key benefits: Oil Control, Blackhead Reducing.
Bentonite
Updated
Bentonite. A colloidal clay. Consists primarily of montmorillonite (CI 77004)
Purpose
Type of clay that is most famously used as an absorbent in oil-reducing face masks. Also functions as a thickener, emulsion stabilizer, and opacifying agent in cosmetic formulations.
Rating
GOOD
Category
Absorbent, Occlusive/Opacifying Agent, Texture Enhancer
INCI Purpose
ABSORBENT, BULKING, EMULSION STABILISING, VISCOSITY CONTROLLING
Benefits
Alternative Names
At a Glance
Clay derived from volcanic ash (which is purified before becoming a cosmetic ingredient)
Most famously used as an oil-absorbing agent in facial masks
Also functions as a thickener, emulsion stabilizer, and opacifying agent in cosmetic formulas
Helpful for oily skin but can be drying for other skin types (when used in high amounts)
Article
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.
References