Encyclopedia
Reference entry
Physiology
Sebum
The scalp’s natural oil, produced by glands beside each follicle.
Soumm · Physiology
Definition
An oily secretion that lubricates hair and skin and contributes to barrier function. Production varies with genetics, hormones, age and climate.
Both excess and deficiency cause discomfort.
Practical note
Aggressive washing to remove sebum often prompts more production. Gentler, less frequent washing is usually better tolerated.
See also: Scalp Barrier, Oiling.
A note on evidence
Hair responds to many things at once: sleep, nutrition, hormonal changes, scalp condition and stress among them. Published here for education only; individual concerns should be discussed with a qualified healthcare professional.