The pH of hair refers to its acidity level, and it is quite acidic.
Understanding Hair pH
The pH scale ranges from 0 to 14, with 7 being neutral. Values below 7 indicate acidity, while values above 7 indicate alkalinity. The pH of your hair is not neutral; it leans towards the acidic side. Understanding the pH of hair is essential for maintaining its health and appearance.
Hair vs Scalp pH
| Body Area | pH Value | Acidity Level |
|---|---|---|
| Hair | 3.67 | Highly Acidic |
| Scalp | 5.5 | Slightly Acidic |
- Hair pH: According to the provided reference, the pH value of hair is 3.67, which is considered highly acidic.
- Scalp pH: The scalp, which is the skin from which hair grows, has a slightly higher pH level of 5.5, still on the acidic side, but less so than the hair itself.
Importance of Hair Acidity
The acidic nature of hair plays a critical role in its structure and health:
- Cuticle Contraction: The slightly acidic pH of hair allows the cuticle layer, the outermost part of the hair strand, to contract. This contraction is important because:
- It helps the hair to lay flat, making it smoother and less prone to tangling.
- It improves hair's shine by allowing light to reflect off the smooth surface.
- It can help to retain moisture within the hair shaft.
Practical Implications
Knowing about hair pH can guide choices in hair care products:
- Shampoos and Conditioners: Many shampoos and conditioners are formulated to maintain this slightly acidic pH to promote the health of your hair. Products that are too alkaline may cause the cuticle layer to open, making hair frizzy, dull, and more prone to damage.
- Chemical Treatments: Hair coloring, perming, and straightening processes often involve chemicals that alter the pH of your hair. It is very important to use pH balanced products when undergoing these treatments.
Conclusion
In summary, hair has a highly acidic pH of 3.67, which is crucial for the proper functioning and overall health of the hair strand. This acidity helps in cuticle contraction, resulting in smoother, shinier, and healthier-looking hair. The scalp has a slightly higher, but still acidic, pH of 5.5.
