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Ingredient comparison · Scalp care

Which anti-dandruff active does what?

See how ketoconazole, selenium sulfide, zinc pyrithione and salicylic acid differ in role, evidence and practical use before comparing individual shampoos.

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Updated
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Quick answer

Ketoconazole, selenium sulfide, zinc pyrithione and salicylic acid do different jobs. The active helps frame the choice, but strength, directions and the rest of the formula still determine how an individual shampoo should be used.

How we compared these options

How do common anti-dandruff shampoo active types differ?

Readers choosing between clearly labelled scalp products and looking for a more useful distinction than strongest versus mildest.

  • Primary role
  • Evidence context
  • Formula dependence
  • Practical limitations
Active types compared by role, evidence context and practical limitations
Active typePrimary roleEvidence contextLimitationsPractical reading
KetoconazoleAn azole antifungal that reduces the growth of susceptible fungi and yeasts.Has systematic-review and controlled-trial support for dandruff and seborrhoeic dermatitis.May be medicated or prescription-regulated depending on strength and market; irritation or dryness can occur.Compare the exact strength, formula and label directions rather than treating all ketoconazole shampoos as equivalent.
Selenium sulfideAn anti-dandruff active with antifungal and scale-reducing effects in shampoo formulations.A controlled trial found both selenium sulfide and ketoconazole superior to placebo for moderate-to-severe dandruff.Hair feel, odour, irritation and compatibility with treated hair can depend strongly on the formula and directions.Use the exact product label; do not transfer contact time or frequency from a different active or strength.
Zinc pyrithioneAn antimicrobial anti-dandruff active used to reduce scalp flaking in some markets and formulas.Clinical comparative evidence exists, including an older trial against ketoconazole in severe dandruff.Permitted uses and product availability vary by jurisdiction, so current local labels and regulations matter.Treat it as a market-specific active rather than assuming an international product has the same formula.
Salicylic acidA keratolytic that helps loosen and remove adherent surface scale rather than acting primarily as an antifungal.Can be useful when scale removal is a central need and is listed in dermatology guidance among dandruff-shampoo actives.Can feel drying or irritating and may not address the yeast-associated part of a dandruff pattern on its own.Judge it by the type and amount of scale, the rest of the formula and scalp tolerance.

Bottom line

Choose by the role you need, then compare the exact strength, formula and directions. An active category cannot tell you how every shampoo will feel or perform.

What we could not verify

  • This compares active types, not individual products or prescription suitability.
  • Strengths, directions and regulatory categories vary by country and formula.
  • Direct comparative evidence is limited and some frequently cited trials are older.

How to read our conclusion

Manufacturer statements describe identity, declarations and label use. Ingredient evidence describes what published research can support. Layer & Strand’s interpretation connects those layers and states uncertainty; it is not a medical prescription or a hands-on test.

Methodology in brief

Inclusion is based on India-market identity and source quality, not affiliate status. Conflicting formulas remain separate records. Read the full methodology.

Evidence trail

Sources