Hair is slightly acidic, with a pH between 4.5 and 5. This natural acidity is primarily due to sebum, the natural oil produced by the scalp.
The Role of Sebum
Sebum is an oily substance secreted by the sebaceous glands in our skin and scalp.
- Natural Oil: Sebum is a complex mixture of lipids, including triglycerides, fatty acids, and waxes.
- Protective Function: This oil forms a protective barrier on the scalp and hair shaft, helping to prevent moisture loss and keep the hair lubricated.
- Acidic pH: Sebum itself is slightly acidic, contributing to the overall acidic pH of the hair.
- Microbial Protection: This acidic environment prevents the growth of harmful bacteria and fungi on the scalp, maintaining its health and preventing infections.
Benefits of Hair's Acidity
The acidic nature of hair has several benefits:
- Prevents Microbial Growth: The acidity creates an unfavorable environment for many types of fungi and bacteria.
- Keeps Cuticles Closed: The slightly acidic pH helps keep the hair cuticles closed, resulting in smoother, healthier, and shinier hair.
- Reduces Frizz: A closed cuticle helps to reduce frizz.
- Overall Health: It maintains the general health and condition of both the hair and scalp.
Summary
In summary, hair is acidic mainly due to sebum produced by the scalp. This acidity is beneficial as it provides protection against microbial growth, keeps cuticles closed, and maintains overall hair and scalp health.
