Your skin is your body's largest organ, and its outermost layer, known as the skin barrier, plays a crucial role in protecting you from external aggressors. This barrier, also called the stratum corneum, is your skin’s first line of defense against environmental pollutants, UV radiation, and harmful microorganisms. It also helps retain moisture, keeping your skin hydrated and healthy. When the skin barrier is compromised, you may experience dryness, irritation, and increased sensitivity. Therefore, maintaining and repairing the skin's natural barrier is essential for overall skin health.