There is no single best dandruff shampoo: ketoconazole and zinc pyrithione target the Malassezia yeast linked to dandruff, while coal tar and salicylic acid slow and loosen scale, which suits thick, stubborn flakes and scalp psoriasis. For ordinary flaking, start with an antifungal and switch or alternate actives if it stops working.
Dandruff shampoo ingredients compared
Each anti-dandruff shampoo is defined by its active ingredient, and they fall into two groups. Mayo Clinic groups ketoconazole, zinc pyrithione and selenium sulfide as antifungals, and salicylic acid and coal tar as anti-itch, anti-flaking treatments.
| Active ingredient | How it works | Best for | How often | Caution |
|---|---|---|---|---|
| Ketoconazole | Antifungal; controls Malassezia | Flaky, itchy dandruff and seborrhoeic dermatitis | Twice a week for 2 to 4 weeks, then every 1 to 2 weeks | Keep out of eyes; stop if irritation or rash |
| Zinc pyrithione | Antifungal | Mild to moderate dandruff, regular maintenance | As the pack directs; often 2 to 3 times a week | Stop if it itches, burns or stings |
| Selenium sulfide | Antifungal; relieves itching and flaking | Dandruff and seborrhoea | Twice a week for 2 weeks, then weekly | Rinse well; can discolour chemically treated hair and damage jewellery |
| Coal tar | Slows skin-cell turnover, reduces scaling and itch | Thick scale, stubborn dandruff, scalp psoriasis | As the pack directs | Can stain light hair; makes skin more sun-sensitive |
| Salicylic acid | Loosens and lifts scale | Build-up and scaly patches, often paired with tar | As the pack directs | Stop if it stings or irritates |
Sources for the table: Mayo Clinic, the NHS ketoconazole guidance and MedlinePlus on selenium sulfide. Whichever you pick, the product label on your bottle comes first.
Ketoconazole shampoo: the antifungal for Malassezia flakes
Ketoconazole shampoo is an antifungal that targets the yeast most closely tied to dandruff. A review of seborrhoeic dermatitis and dandruff explains that across the many treatments that work, including azoles such as ketoconazole, selenium and zinc, the one shared mechanism is antifungal activity.
It is sold at 1% over the counter in the US, according to the Nizoral Anti-Dandruff label, and at 2% in other products. Our Nizoral Shampoo is labelled ketoconazole 20 mg/g (2%) and is described for dandruff and seborrhoeic dermatitis. Vavo Shampoo is another antifungal option, described for dandruff and seborrhoeic dermatitis caused by Malassezia overgrowth, with a 10-minute contact time on its directions.
Leave ketoconazole on for 3 to 5 minutes and don’t use it more than the label says. Our guide on how to use Nizoral shampoo covers timing and curly-hair tips step by step.
Zinc pyrithione, selenium sulfide and piroctone olamine
These are the other main antifungals, usually found in everyday anti-dandruff shampoos you can use for maintenance. Mayo Clinic lists zinc pyrithione and selenium sulfide alongside ketoconazole as shampoos that target the fungus thought to drive dandruff.
Zinc pyrithione is the active in our 2 In 1 Pyrithione Zinc Anti-Dandruff Shampoo + Conditioner, which has built-in conditioners and directions to use it at least twice a week. A 2-in-1 suits curly hair that dislikes a stripping wash, though thick or coily hair will still want a separate conditioner on the lengths.
Selenium sulfide relieves itching and flaking, and MedlinePlus advises leaving it on for only 2 to 3 minutes, never overnight, removing jewellery first and rinsing with cool water for at least 5 minutes if you colour, bleach or perm your hair, to avoid discolouration.
Piroctone olamine is an antifungal widely used for dandruff, and it is the active in Sebamed Anti-Dandruff Shampoo, which is made for oily hair and a dandruff-prone scalp. Our guide to choosing a Sebamed shampoo compares it with the rest of the range.
Coal tar and salicylic acid: for thick scale and scalp psoriasis
Coal tar and salicylic acid are the better fit when flakes are thick, stuck down or part of scalp psoriasis rather than ordinary dandruff. Guy’s and St Thomas’ NHS guidance says a coal tar shampoo may be all you need for mild flaking, that tar is often combined with scale-lifting agents such as salicylic acid, and that tar shampoos should be massaged in and left for 5 to 10 minutes before rinsing.
Dermatar Therapeutic Shampoo contains both coal tar and salicylic acid; its description explains that coal tar helps the scalp shed dead cells and slows skin-cell growth to reduce scaling and itch. The Guava & Ginger Anti-Dandruff Shampoo uses salicylic acid without tar, is sulphate-free and is described as helping to detangle textured hair, which makes it a gentler choice for curls with build-up.
Tar has trade-offs: Mayo Clinic notes it can darken or stain light-coloured hair and make the scalp more sensitive to sunlight, which matters under the UAE sun. If you suspect psoriasis, our scalp psoriasis guide covers the full range of treatment options, and the NHS guidance advises seeing a doctor if your scalp hasn’t improved after 4 weeks.
Which shampoo is best for dandruff? How to choose
Match the active to your flakes, then give it a few weeks before judging it. Use this as a starting point:
- White, itchy flakes, oily scalp: start with an antifungal such as ketoconazole, zinc pyrithione or piroctone olamine. Our guide to oily dandruff vs dry dandruff helps you tell which you have.
- Greasy yellow scale with redness: this may be seborrhoeic dermatitis, where an antifungal such as ketoconazole is the usual first step.
- Thick, stuck-on scale or plaques: try coal tar with salicylic acid and get it checked for psoriasis.
- Product build-up on curls: a salicylic acid shampoo can lift residue and loose scale.
Mayo Clinic suggests alternating shampoos with different actives if one stops helping, washing textured hair only when it needs it, and seeing a doctor if a few weeks of dandruff shampoo hasn’t helped, as a stronger prescription shampoo or a steroid lotion may be needed. Stop any shampoo that causes itching, burning or stinging. You can compare every option side by side in our anti-dandruff shampoos.
Dandruff shampoo FAQ
Is ketoconazole stronger than zinc pyrithione?
Both are antifungals that target the same yeast. Ketoconazole is a medicine with set treatment courses, while zinc pyrithione is common in everyday anti-dandruff shampoos. If one doesn’t help after a few weeks, try the other.
What is the best psoriasis shampoo?
For mild scalp psoriasis, coal tar shampoos, often combined with salicylic acid, are a common first step. More severe scalp psoriasis usually needs treatment from a doctor alongside them.
Can I use anti-dandruff shampoo on curly hair?
Yes. Apply it to the scalp only, use it as often as the label says rather than every wash, and follow with conditioner on your lengths.
Can I alternate two dandruff shampoos?
Yes. Mayo Clinic suggests switching between shampoos with different active ingredients, for example an antifungal on one wash day and a tar or salicylic acid shampoo on another.
