In the skin sebum?
Score: 4.8/5 (23 votes) Sebum is a sticky, oily substance produced by the sebaceous glands, which sit in the middle layers of the skin, near hair follicles. Sebum helps moisturize and protect the skin. ... Human sebum consists of 57.5% triglycerides and fatty acids, 26% wax esters, and 12% squalene,...