Explain the concept of pH in skincare and why maintaining a balanced pH is important for the skin's barrier.

• A. Skin pH is neutral around 7.
• B. Skin pH is typically around 6-7.
• C. Skin pH is typically around 4.5-5.5; balanced pH maintains enzymatic activity, barrier integrity, and microbiome.
• D. pH has no impact on the skin.

Answer: (C)

Maintaining a slightly acidic environment is essential for healthy skin. The skin’s natural pH sits in the acidic range, typically about 4.5 to 5.5. This balance supports enzymatic processes that regulate desquamation, helps organize and preserve the outer lipid barrier, and fosters a healthy microbiome. When the pH shifts toward neutral or alkaline, the barrier can become more permeable, water loss increases, and irritants or microbes can penetrate more easily, leading to sensitivity or irritation. So a pH around 4.5–5.5 with a balanced level that supports these processes is best for keeping the barrier intact and the skin functioning well. The other statements are less accurate because skin isn’t typically neutral or highly alkaline, and pH does impact skin health.