Where on the PH scale is anti dandruff shampoos?

The pH of most anti-dandruff shampoos falls between 4.5 and 6.5. This range is considered to be slightly acidic and it helps to maintain the natural balance of the scalp. Dandruff is caused by an overgrowth of a type of fungus called malassezia, which feeds on the oils produced by the scalp. By lowering the pH of the scalp, anti-dandruff shampoos help to create an environment that is less hospitable to the fungus. Some other shampoos can have a pH as high as 9.0 to combat lice.