Expertly formulated for sensitive scalps, prone to dandruff, the Kérastase Symbiose Intensive Anti-Dandruff Cellular Night Serum works to eliminate the appearance of dryness, whilst offering a gentle soothing effect.Formulated with a high-performance blend of salicylic acid, piroctone olamine and bifidus, the potent serum replenishes lost moisture to encourage a refreshed appearance. Topped with a delicate fragrance, the milk-like gel texture boasts non-sticky and non-greasy properties and can be used during a four-week period.91% of consumers agreed hair & scalp condition made them feel good about themselves**88% of consumers agreed that the scalp is hydrated**78% of consumers agreed that hair feels healthier****Self-Assessment and Clinical study on 37 people, 4 weeks of use.