Scalp advanced anti Oiliness. The 1st professional scalp care, ultra-concentrated with dermatological actives to reset to a healthy scalp. Developed with pros. Approved by dermatologists. Powered by [3% AHA + 6% Clay]. AHA: water-soluble acid made from fruits. It helps to purify the surface of your skin so that new skin cells can generate. Clay: soft, fine-grained minerals that can do a soft peel on the skin to help to unclog skin surface from dirt, oil and sweat.