Which type of oil is secreted by sebaceous glands?

Sebum is the oil secreted by sebaceous glands, playing a vital role in skin health. This oily substance is composed of triglycerides, wax esters, squalene, and free fatty acids. Sebum serves to lubricate the skin and hair, helping to maintain moisture levels and providing a protective barrier against environmental factors. This natural oil also has antimicrobial properties, helping to prevent infections by inhibiting the growth of harmful bacteria on the skin's surface.

In contrast, squalene is a component of sebum but not the main product of sebaceous glands itself. Cholesterol is another lipid that is present in cell membranes and plays various biological functions but is not produced by sebaceous glands. Lastly, melanin is the pigment responsible for skin color and does not pertain to the oily secretion of sebaceous glands. Understanding the role of sebum and its significance in skincare highlights the importance of maintaining a balanced skin environment to promote overall skin health.