2) NMFs (Natural Moisturizing Factors), hydroregulation factors
NMFs are molecules that can bind water within the horny layer; they are called humectants. The most commonly known NMFs are urea and lactic acid.
Other substances used in cosmetics have the same properties; these include glycerine and xylitol.
How can you tell the difference between dry skin and dehydrated skin?
Dehydrated skin is always a temporary condition that can be reversed with appropriate products.
It is an alteration in the superficial layer of the epidermis that lacks water. This lack of hydration disturbs the skin’s barrier function and leads to discomfort.
On the other hand, dry or very dry skin is a permanent condition that describes a particular skin type that is lacking both water and lipids.
Who is affected?
All skin types can become dehydrated in certain circumstances or during particular seasons.