Your pH level refers to how acidic or how alkaline your skin's protective barrier is. When your barrier does not have a balanced pH level, impurities can thrive in their environment. Your skin is naturally designed to fight off infection and environmental stresses, and your skin's ability to do so is determined by its pH level.
On the pH scale, 0 is the most acidic, 7 is neutral, and 14 is the most alkaline. Your skin should be slightly acidic to inhibit bacteria from being able to grow. The Saranghae Perfect Balance Toner has been specially formulated to adjust your pH level to an optimal 5.5.
Example: a household bar of soap has a pH level of roughly 10. This is why it completely dries out your skin and leaves a tight, awful feeling.