Sebum is an oily, waxy substance produced by your body’s sebaceous glands. It coats, moisturizes, and protects your skin. 

It’s also the main ingredient in what you might think of as your body’s natural oils. 

So, what exactly is sebum made up of? As an article from Harvard Medical School explains, “sebum is a complex mixture of fatty acids, sugars, waxes, and other natural chemicals that form a protective barrier against water evaporation.”

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