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The Philip Kingsley Overnight Scalp Barrier Serum strengthens your scalp’s barrier function, and balances oil, hydration and microflora, helping to support long-term scalp health. This serum works with your skin’s circadian rhythm while you sleep, and helps to create a healthy, balanced scalp environment, supporting long-term scalp health and minimising the onset of scalp issues. Suitable for all hair and scalp types, this soothing formulation is powered by a pioneering Triple Balancing Action, which fortifies scalp health in three ways: improves hydration, regulates oil production and balances microflora.