Philip Kingsleys Overnight Scalp Barrier Serum with Triple Balancing Action is formulated to nourish the scalps natural barrier. The fast-absorbing formula is applied as drops to sections of the scalp, working to lock in moisture and minimise excess oil. n Powered by a Triple Balancing Action alongside aloe vera and AHAs, the serum gently exfoliates and clarifies, while delivering a soothing sensation. The scalp serum is designed to be used overnight while you sleep and is suitable for all scalp types.