Healthy skin contains Natural Moisturizing Factors (NMFs) which attract and bind in water to the outermost layers of skin, helping to prevent it from drying out and becoming scaly and rough. The NMFs present in skin include substances such as amino acids, inorganic salts, Lactate and Urea. The UreaRepair PLUS range replicates the natural composition of NMFs in healthy skin, giving dry skin the substances it needs for optimal hydration.