North Carolina Cosmetic Arts Practice Exam

What is the ideal pH level for healthy skin?

1. 3 to 4

2. 4.5 to 5.5

3. 6 to 7

4. 7.5 to 8

The correct answer is: 4.5 to 5.5

The ideal pH level for healthy skin is between 4.5 and 5.5. This range is slightly acidic, which is important for maintaining the skin’s natural barrier function. The skin's acidity helps to inhibit the growth of harmful bacteria and supports the function of enzymes that preserve skin health and vitality. An optimal pH level also aids in retaining moisture, protecting against environmental pollutants, and contributing to overall skin resilience. When the pH level shifts outside this range, whether becoming too acidic or too alkaline, it can lead to various skin issues, such as dryness, irritation, or a predisposition to infections and other dermatological problems. Thus, maintaining a pH within this ideal range is crucial for healthy skin function and appearance.