Fastabsorbing and skincareinspired, Overnight Scalp Barrier Serum is designed to support and strengthen the scalp's natural skin barrier function. Working with your skin's circadian rhythm while you sleep it helps to create a healthy, balanced scalp environment, support longterm scalp health, and minimise the onset of scalp issues. Why Use: The scalp is essentially an extension of the skin on your face, and, as with the skin on the face, it has a skin barrier to help protect and keep it healthy.