Minnesota Cosmetology State Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

The recommended pH level for products applied to the skin is typically within the range of 4 to 5. This pH level is considered optimal because it aligns closely with the natural acidity of human skin, which generally has a pH around 5.5. Maintaining a slightly acidic pH helps to support the skin's natural barrier, promotes healthy skin flora, and minimizes the risk of irritation or adverse reactions. Products formulated within this pH range are less likely to disrupt the skin's protective layer, making them more suitable for regular use.

In contrast, products with a higher pH, such as those in the 8-9 range, can be too alkaline, potentially leading to skin irritation and compromising the acid mantle protective barrier. Likewise, products with a very low pH level, such as those from 1 to 3, can be too harsh for the skin, resulting in irritation, peeling, or other adverse effects. Therefore, pH levels that fall outside the 4-5 range can disrupt the skin's natural balance and are generally not recommended for use on the skin.