Is Shampoo Bar ph neutral Balanced? A shampoo bar based on surfactants will likely have a Shampoo bar pH balance, ranging between 4.5 and 6.5. The substances that were utilized in its production will determine the pH of the shampoo bar. The pH of your shampoo bar and the soap in it are most likely to blame. What Is the Importance of PH in Hair? For the cuticles to stay closed and healthy, we must maintain a pH level between …