What substance lubricates the skin?

Lipids are the key substances that lubricate the skin. They are a diverse group of organic compounds that are hydrophobic, meaning they repel water. This characteristic allows lipids to form a barrier on the skin's surface, preventing moisture loss and providing protection from environmental elements. The skin contains natural oils, primarily composed of triglycerides, fatty acids, and waxy substances, which contribute to its hydration and elasticity.

While water is crucial for hydration, it does not provide lubrication on its own; rather, it works in conjunction with lipids to maintain skin moisture. Minerals play various roles in skin health, such as supporting cellular functions and maintaining structural integrity, but they do not specifically lubricate the skin. Proteins, such as collagen and elastin, provide structural support and elasticity but are not responsible for lubrication in the same manner as lipids. Thus, lipids are essential for maintaining skin health by providing the necessary lubrication and protective barrier.