Water constantly evaporates from the deeper layers of the skin, an effect known as transepidermal water loss . Since dry skin is brittle and rigid, any increase in the water content of skin is believed to improve the skin quality. The ability to retain moisture depends on the lipid bilayer between the corneocytes.[1]
Emollients prevent evaporation of water from the skin by forming an occlusive coating on the surface of the stratum corneum. TEWL is normally about 4–8 g/(m²⋅h). A layer of petrolatum applied to normal skin can reduce the TEWL by 50–75% for several hours.
Benefits :
Applying your moisturizer correctly, on the other hand, boosts hydration in your skin, prevents flaking and dullness, and creates a protective layer of moisture that lasts all day. Plus, proper application of a face cream will help anti-aging ingredients work better — increasing the odds that they'll work
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