IMPERATIVE FOR ALL SKIN. Reestablishes + maintains barrier function, essential for a radiant complexion. KRISTINA HOLEY intended this product to be initially used for clients with weakened barrier layers, but found through client trials that everyone reported an increase in comfort in their skin, less need for heavy moisturizers, and an absence of dryness even in extreme conditions. The key to healthy skin is water balance of the stratum corneum. This groundbreaking serum maintains barrier function in two ways. First, it replaces NATURAL MOISTURIZING FACTOR, a collection of water soluble compounds which keep skin cells hydrated. Secondly, it prevents loss of NMF via a liposomal sealing system that traps water molecules instead of letting them absorb into the lower layers of the epidermis.