| Popis: |
Moisturizing of the skin depends on both the penetration of water present in dermis, and the skin’s ability to retain water on its surface. The movement of water from the dermis to the surface encounters barriers: a natural moisturizing factor (NMF), as well as a water-lipid surface covering the skin. An important role in the evaporation of water through the skin is also played by external factors, such as air temperature, surfactants and disease states. To reduce water loss by the skin, many natural moisturizers are used, including hydrophilic water-binding on the epidermis (hyaluronic acid, chitosan, collagen, sorbitol), penetrating into the epidermis (glycerol, urea, biotin), hydrophilic occlusive substances (beeswax, cetyl alcohol, soybean lecithin), and modifying the epidermal barrier (ceramides, cholesterol, NUFA). |
