Sebum is not solely a wax, but it contains a significant amount of wax esters. It's more accurately described as a complex mixture of substances.
The Composition of Sebum
Sebum, secreted by sebaceous glands, is a complex oily and waxy substance that plays a crucial role in skin health. Its composition isn't solely wax; instead, it's a blend of various lipids:
- Triglycerides: These form the largest proportion (around 57.5%) of sebum.
- Wax Esters: A substantial component (around 26%), contributing to its waxy texture.
- Squalene: Another significant component (around 12%).
- Free Fatty Acids: Also present in notable quantities.
- Cholesterol esters and free sterols: These are additional components found in smaller amounts.
The references provided repeatedly highlight the presence of wax esters within sebum's complex composition, but never classify sebum as purely a wax. Instead, they emphasize its multifaceted nature, which includes a significant amount of triglycerides and other lipids.
Sebum's Function
Sebum's primary function is to moisturize and protect the skin. This oily substance helps prevent dryness and cracking, creating a protective barrier against environmental factors.
The presence of wax esters contributes to sebum's texture and its ability to form a protective film on the skin's surface.
