What type of shampoo is characterized by low pH levels?

Mild shampoos are characterized by their low pH levels, which typically range from 4.5 to 6.5. This pH range is more aligned with the natural pH of the hair and scalp, which helps to maintain the hair's natural balance. By being less alkaline than other types of shampoos, mild shampoos are gentler on the hair and skin, reducing the risk of irritation and helping to retain moisture. This makes them particularly suitable for people with sensitive skin or for those who wash their hair frequently.

In contrast, medicated shampoos often contain active ingredients designed to treat specific conditions like dandruff or scalp infections, and these may have a varied pH depending on their formulation. Detergent shampoos are typically formulated with harsher surfactants aimed at deep cleansing, making their pH higher. Protein shampoos, while beneficial for strengthening hair, do not necessarily have a low pH; their primary function is to provide protein which can sometimes alter the hair's pH balance. Thus, mild shampoos stand out for their compatibility with the scalp's natural environment due to their low pH levels.