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'PH-balanced' in relation to hair products refers to a formulation that has a pH level similar to that of natural hair and skin. The human hair and scalp typically have a pH range of about 4.5 to 5.5, which is slightly acidic. Maintaining a pH balance within this range helps to preserve the hair's natural moisture, prevent damage, and support healthy hair and scalp conditions.

When hair products are pH-balanced, they minimize the risk of altering the hair's structure or causing irritation to the scalp. Products that are either too alkaline or too acidic can lead to issues such as dryness, frizz, or scalp irritation. Thus, using pH-balanced products is essential for maintaining the health and integrity of hair.

The other options, while beneficial to hair care, do not specifically relate to the concept of pH balance. For instance, being alcohol-free may help avoid dryness, sulfate-free formulations are less harsh on the hair, and protein content can strengthen hair. However, none of these directly addresses the pH level in relation to natural hair and skin, which is the key aspect of being pH-balanced.