Which type of shampoo matches the ideal pH of hair more closely?

The ideal pH of hair is slightly acidic, typically ranging from about 4.5 to 5.5. This natural acidity helps to maintain the integrity of the hair cuticle, which protects the inner structure of the hair and prevents damage.

Slightly more acidic shampoos help to match this ideal pH and ensure that the hair remains healthy, shiny, and manageable. They can also help to close the cuticle, reducing frizz and making hair easier to style. On the other hand, shampoos that are too alkaline can raise the cuticle, leading to increased damage, tangling, and loss of moisture.

Neutral pH shampoos have a pH of around 7 and do not effectively mimic the natural acidity of hair, making them less ideal for maintaining hair health. Highly alkaline shampoos can actually harm the hair by damaging the cuticle structure, leading to more severe issues like dryness and breakage. Hence, the correct option effectively supports the overall health and appearance of the hair.