The Skin Barrier
Understanding the physiological interface where cosmetic chemistry meets human biology.
LAYER 1: EXTERNAL
The Acid Mantle
A very fine, slightly acidic film on the surface of human skin acting as a barrier to bacteria, viruses, and other potential contaminants.
Read Module
LAYER 2: STRUCTURAL
The Stratum Corneum
The "brick and mortar" model. How corneocytes (bricks) and the intercellular lipid matrix (mortar) regulate permeability and hydration.
Read Module