What is sebum?

• A. A gas that hydrates skin
• B. Oil that protects the epidermis and lubricates skin and hair
• C. A type of sunscreen
• D. A water-soluble product

Answer: (B)

Sebum is an oily substance produced by sebaceous glands in the skin. It plays a crucial role in maintaining skin health by forming a protective barrier over the epidermis, preventing moisture loss and providing lubrication to both the skin and hair. This oily mixture consists of triglycerides, wax esters, squalene, and metabolites, which contribute to its hydrating properties and its ability to trap moisture in the skin. By doing so, sebum helps to keep the skin supple and protects it from environmental factors that could lead to dryness or irritation.

The other options do not accurately describe sebum's properties or functions. For instance, it is not a gas, nor is it classified as a sunscreen, and it is definitely not water-soluble, as sebum's oil-based nature is integral to its protective roles in the skin.