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The pH range considered to be acid balanced is between 4.5 and 5.5. This range is significant because it corresponds to the natural acidity of the skin, which is essential for maintaining its barrier function and overall health. The slightly acidic environment created by the skin's natural oils and secretions helps to fend off harmful bacteria and fungi while also supporting the skin's moisture levels.

Products that fall within this pH range are generally more compatible with the skin, promoting better absorption and minimizing irritation. This is why many skincare formulations, particularly cleansers and moisturizers, are designed to be within the 4.5 to 5.5 pH range.

Understanding this pH balance is crucial for estheticians to provide effective treatments that respect and enhance the skin's natural state.