Quaternium-90 Bentonite

Quaternium-90 Bentonite is a modified form of bentonite, a natural clay mineral derived from volcanic ash. In this version, the clay has been treated with quaternium compounds to alter its properties and make it suitable for use in skincare formulations.In cosmetic products, it primarily functions as a viscosity controlling agent—helping to thicken or stabilise formulations. Beyond this technical role, bentonites are believed to offer skin-conditioning benefits owing to their mineral composition and historical use in dermatological applications.

Bentonites work through several mechanisms. Their porous, layered structure allows them to absorb oils and impurities from the skin surface. They also possess a net negative charge, which means they can attract and bind positively charged particles—a property that may contribute to their cleansing and soothing effects.When incorporated into skincare formulations, the quaternium modification allows the clay to disperse more evenly and remain stable in creams and lotions, ensuring consistent delivery of these benefits across the product.

Quaternium-90 Bentonite is typically incorporated into formulations by the manufacturer rather than used as a standalone ingredient. It appears in moisturisers, creams, and protective formulations at low concentrations. Use products containing this ingredient as directed—usually daily as part of your regular skincare routine. If combining with other actives, introduce gradually to monitor for any sensitivity.

Bentonite and its derivatives are generally well-tolerated and considered safe for topical use. Those with sensitive skin should patch-test first, though allergic reactions are uncommon.