Gentle enough for sensitive scalps, the Biolage Scalp Sync Calming Shampoo washes away impurities while leaving a hydrated, balanced feel for up to 72 hours. Microdosed with a carefully calibrated concentrate of a fermented tea blend and filtered glycolic acid, the formula protects against flakes, excess sebum, oiliness and dryness, creating an optimum environment for scalp health. Its lightly foaming consistency instantly freshens the strands while leaving them soft, glossy and smooth once dried.