Even if you haven’t heard of bentonite clay before, odds are you've probably used it in your skincare routine at least once or twice without even realizing. It’s a powder that's derived from volcanic ash and is used as an ingredient in a lot of purifying and acne-clearing products thanks to its ability to soak up and remove impurities and excess oil, according to Marnie Nussbaum, MD, a dermatologist based in New York.

But, it’s also having a moment because people are using bentonite clay on its own as a DIY mask or facial cleanser. They're also buying it in bulk for super cheap. That's right, you can typically get an entire pound (or two) of bentonite powder for under $20. Intrigued yet? Keep reading for everything you need to know about bentonite clay and more.