In acid-balanced hair products, the pH is within what range?

• A. 3.0 to 4.0
• B. 6.0 to 7.0
• C. 4.5 to 5.5
• D. 5.5 to 6.5

Answer: (C)

Acid-balanced hair products are made to support the hair and scalp’s natural slightly acidic environment. When the product stays in this mild acidity range, the hair cuticle lies flatter and forms a tighter seal, which helps retain moisture, adds smoothness and shine, and reduces frizz. It also helps with color retention and minimizes residue from minerals in water. If the product is too alkaline, the pH rises, the cuticle lifts and swells, and hair can become rough, dry, or damaged. If it’s overly acidic, it can irritate the scalp or be drying. So the range that keeps things mildly acidic—closer to the hair and scalp’s natural pH—is the best fit for acid-balanced products.