What pH is Best for Hair?
The ideal pH for hair is slightly acidic, ranging from 4.5 to 5.5. Maintaining this pH level is crucial for healthy, strong hair. A pH outside this range can lead to damage and dryness.
Your hair's natural pH is acidic, typically between 4.5 and 5.5. This slightly acidic environment is essential for maintaining the integrity of the hair cuticle, the outermost layer protecting each strand. When the pH becomes too alkaline (higher than 5.5), it can cause the hair cuticle to lift, leading to frizz, dryness, and damage. Conversely, while less common, a very acidic pH can also be problematic.
Several sources confirm this optimal range:
- Redken Artist George Garcia states that hair is healthiest at a pH of 4.5 to 5.5. https://www.redken.com/blog/why-the-ph-of-your-hair-is-important.html
- The subreddit r/HaircareScience suggests staying within a pH of 4-6 for hair integrity, with a preference for a lower pH (closer to 4) for colored or damaged hair. https://www.reddit.com/r/HaircareScience/comments/v09utf/lets_talk_about_ph_of-hair-products/
- Other sources also emphasize the importance of maintaining a slightly acidic pH between 4.5 and 5.5 for healthy hair. https://www.healthshots.com/beauty/hair-care/keep-your-hair-nourished-with-the-right-ph-level-using-these-tips/
Maintaining Optimal Hair pH
Many hair products can disrupt the natural pH balance. Therefore, choosing products with a pH within the ideal range (4.5-5.5) is important for maintaining healthy hair. Rinsing with water that is too alkaline can also counteract the benefits of using pH-balanced products; therefore, consider using filtered water if your tap water is very alkaline.
Consequences of Imbalance
An alkaline pH can lead to:
- Increased friction: This results in breakage and damage. https://pmc.ncbi.nlm.nih.gov/articles/PMC4158629/
- Cuticle lifting: This makes hair more prone to damage and dryness. https://www.healthshots.com/beauty/hair-care/keep-your-hair-nourished-with-the-right-ph-level-using-these-tips/
