What component helps maintain the skin’s moisture barrier?

Sebum plays a crucial role in maintaining the skin's moisture barrier. It is an oily substance produced by the sebaceous glands, which helps to lubricate the skin and hair, preventing dryness and flakiness. By forming a protective layer on the skin’s surface, sebum aids in preventing water loss, helping to keep the skin hydrated and healthy. This barrier function is essential for protecting the skin from environmental stressors, pathogens, and irritants.

In comparison to other options, sweat primarily helps regulate body temperature and may evaporate quickly, while keratin serves as a structural protein that contributes to the skin's resilience and strength. Collagen, on the other hand, provides support and elasticity, but it does not directly play a role in moisture retention like sebum does. Understanding the functions of these components highlights the essential role sebum plays in skin health and moisture retention.