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How does skin keep its moisture?

Moisture in skin is retained by lipid, natural moisturizing factor (NMF) and ceramide. All these components are found in the peripheral of the stratum corneum (skin’s outer layer).

1. Lipid
Lipid is a layer of oil that covers our skin to prevent moisture within our body from evaporating, and also to maintain a minimal level of moisture in stratum corneum.

2. Natural Moisturizing Factor (NMF)
NMF, such as amino acids, helps to retain moisture in cells by attaching itself to water.

3. Ceramide
Ceramide, which accounts for over half of the amount of intercellular lipids, retains moisture among skin cells. It also strengthens intercellular bonds to prevent external irritation from invading skin.