húðbarrieruna
Húðbarrieruna, often referred to as the skin barrier, is the outermost layer of the epidermis. Its primary function is to protect the body from external threats such as pathogens, irritants, and allergens. It also plays a crucial role in preventing water loss from the body, thereby maintaining skin hydration. This protective layer is composed of several key components, including corneocytes (dead skin cells) embedded in a lipid matrix made up of ceramides, cholesterol, and fatty acids. This structure creates a semi-permeable shield that selectively allows beneficial substances to pass while blocking harmful ones.
The integrity of the skin barrier is vital for overall skin health. When the barrier is compromised,