Sunday 13 December 2009

What Do Moisturisers Actually Do?

Moisturisers are generally used to treat dry, scaly skin. Our skin becomes dry when water is lost from the top layer of dead skin cells faster than moisture can enter it from the living layers of skin below.

Moisturisers can correct this problem in two ways: by preventing further moisture loss and by adding substances that increase the water-holding capacity of the skin.

Occlusive moisturisers may contain oils such as isopropyl palmitate, stearyl alcohol or light mineral oil. The oils form a waterproof layer on the skin, reducing evaporation and allowing the body’s natural process of rehydration to return the skin to a normal water level.

Humectant moisturisers may contain substances like glycerine or alpha hydroxy acids (fruit acids such as glycolic acid, citric acid or lactic acid), which add water to the top layer of skin.