Prep your scalp on wash days using the Biolage Scalp Sync Purifying Scalp Concentrate. The pre-shampoo treatment is crafted to gently refine the scalp, catering to oily, dry, or sensitive skin. n The rinse-off formula uses glycolic acid to help lift away buildup and excess oil, while fermented black tea gently refreshes the scalp. Showcasing a fluid, lightweight texture, the formula is designed to cleanse without stripping away moisture, preparing hair for a more effective hair wash routine.