The Biolage Scalp Sync Purifying Scalp Concentrate is a targeted pre-shampoo treatment expertly formulated to rebalance and purify the scalp, effectively addressing concerns of buildup, excess oil, and impurities for all scalp types, including sensitive. Enriched with potent glycolic acid and black tea ferment, this gentle yet effective concentrate works to exfoliate the scalp, leaving it feeling thoroughly cleansed and refreshed while promoting optimal scalp health. For best results, apply this rinse-off treatment to the scalp before shampooing to optimise clarity and comfort