pH Levels in Anti-Dandruff Shampoos: Why Acidity Matters

Most anti-dandruff shampoos have a pH of 4.5–6.5 (slightly acidic). This maintains the scalp's natural acid mantle and inhibits Malassezia—the fungus that feeds on scalp oils and causes dandruff.

By contrast, some lice-treatment shampoos have pH up to 9.0 (alkaline).

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