What is the primary function of sebum in the skin?

The primary function of sebum is to provide moisture and protection to the skin. Sebum is an oily substance produced by sebaceous glands, which is vital for maintaining healthy skin. It creates a barrier on the skin's surface that helps to keep moisture in, preventing excessive dryness. Additionally, the oily nature of sebum offers a protective layer that can guard against environmental pollutants, bacteria, and other external factors that might harm the skin. This protective and moisturizing role is essential for maintaining skin integrity and overall health.

Other options do have functions within the skin, but they do not relate to sebum. Melanin production is primarily the role of melanocytes and is responsible for skin pigmentation. Keratin, produced by keratinocytes, is a protein that provides strength and resilience to the skin, hair, and nails. Skin growth is a complex process involving multiple layers and cell types, but sebum does not promote faster skin growth. Each of these functions addresses different aspects of skin physiology, making them distinct from the role of sebum.