Act Acre Scalp Build-Up System (Scalp Detox & Stem Cell Scalp Serum). This Trichologist approved duo removes build-up and restores the scalp's hydration levels. The Scalp Detox Cleansing Oil breaks down excess sebum and product residue. Paired with the Stem Cell Serum. this system promotes healthy. full-looking hair and creates an optimal environment for hair growth.