Importance of sebum in hair?

Sebum plays a crucial role in the health and maintenance of hair. According to Andrew Huberman, sebum is an oily substance produced by sebaceous glands located near hair roots. It serves several important functions:

1. Waterproofing and Sealing: Sebum forms a protective barrier around the hair shaft as it emerges from the skin, which is essential for waterproofing. This property helps keep the skin dry and prevents excess water absorption, which can weaken hair strands.

2. Antibacterial and Antimicrobial Properties: Sebum acts as a natural antibiotic, guarding the hair and scalp against bacterial and microbial infections. This protective role is vital for maintaining scalp health and preventing issues like dandruff and dermatitis.

3. Immune Function and Skin Protection: The oils in sebum also contribute to the skin's immune function by creating a barrier that prevents pathogens from reaching the hair root and skin surface, thereby reducing the risk of infections.

The overall health of hair, including attributes like shine and texture, is significantly impacted by the presence and balance of sebum. Too little can lead to dry, brittle hair, while too much may cause oily hair and scalp issues 1 2.