Which of the following statements associated with shampoos is true?

A slightly acidic shampoo closely matches the ideal pH of hair, which is typically around 4.5 to 5.5. Maintaining a pH level within this range is crucial for preserving the hair’s natural oils and structural integrity. Acidic shampoos help to close the cuticle layer of the hair, making it smoother and shinier, while also preventing damage and frizz. Since hair is naturally slightly acidic, using a shampoo that aligns with this pH not only cleanses effectively but also promotes overall hair health, making this statement true.

In contrast, shampoos with high alkalinity can lead to a raised cuticle, causing the hair to become porous and brittle, which is not ideal for any hair type. Furthermore, not all shampoos need to be pH neutral; different hair types may benefit from varying pH levels, particularly those that favor a slightly acidic formulation. Lastly, while sulfates are effective cleansers, they can strip moisture rather than provide it, making high sulfate content less desirable for moisturizing purposes. Therefore, the statement about slightly acidic shampoos aligns with the established best practices in hair care.