Murad Cellular Hydration Barrier Repair Serum 30ml Brand New RPR £72. One way to help soothe a damaged skin barrier? The Cellular Hydration Barrier Repair Serum (30ml) from Murad. Formulated with biomimetic hexapeptide-9 (which delivers restorative peptides to reduce water loss and keep skin hydrated), this serum works to plump and firm your complexion. It also features nourishing bilberry seed oil (from handpicked berries, no less) to provide the fatty acids that an overall healthier moisture barrier needs. Oh, and we can't forget the infusion of super hydrating hyaluronic acid molecules that form a protective layer to continuously deliver water to the skin. Hello, hydration...