What pH level will tend to dry the skin?

A pH level of 3 is considered quite acidic and can lead to skin dryness. The skin's natural pH level typically ranges from 4.5 to 5.5, which helps maintain its barrier function and hydration. When the pH level drops to 3, it can disrupt the skin's natural balance, causing it to become too dry and irritated. This high acidity can strip away natural oils and moisture, leading to a compromised skin barrier and increased transepidermal water loss, which contributes to dryness and discomfort.

In contrast, a pH level of 5 is mildly acidic and aligns more closely with the skin's natural pH, supporting its barrier function. A neutral pH of 7 does not provide the optimal balance for skin health, but it is not as detrimental as a level of 3. A pH of 9 is alkaline and also can lead to dryness, but it is not as harsh as a pH of 3 on the skin, which is why it is important to recognize the significant effects of high acidity on skin health.