What is Bentonite Clay? Bentonite clay is a natural substance formed from the weathering of volcanic ash. It appears as a fine, light grey powder that transforms into a thick paste when mixed with water. Named after Fort Benton, where the largest deposits are located, bentonite clay is found worldwide and has been utilised for centuries. Historically, it was used in traditional medicine for its health benefits and rich mineral content, including magnesium and iron. Uses of Bentonite Clay Bentonite clay is widely used in the cosmetics industry, appearing in products like creams, hair masks, lotions, body scrubs, and face masks. It is known for its ability to remove impurities, oil, and toxins from the skin, making it particularly beneficial for those with oily skin types, as it effectively absorbs dirt and excess oil.