Greasy hair isn’t exactly the aesthetic many of us strive to attain. But as it turns out, hair grease is (like many things in life) healthy in moderation. The oily substance is technically called “sebum,” and it’s naturally produced by a sebaceous gland that’s located below the surface of the scalp and connected to the hair follicles. In addition to sebaceous oil from the scalp pores, Paul Labrecque of Paul Labrecque Salon and Spa says pollutants from the atmosphere can contribute to greasy hair.
Sebum provides necessary hydration to both your scalp and your hair itself. The amount of oil excreted by the scalp runs the gamut depending on the person, which explains why some of us have greasy-looking hair less than 24 hours after a shampoo and others can easily go a week without washing their hair.
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