An anti-dandruff shampoo works because of one named active ingredient, not because of the word on the front of the bottle. Learn six or seven names and you can read any anti-dandruff label: climbazole, piroctone olamine, selenium sulfide and salicylic acid can appear in cosmetic shampoos in the EU, while ketoconazole shampoos are sold as medicines in the UK and coal tar shampoos, where available, are medicines. Zinc pyrithione, the name older advice still mentions, has been banned from EU cosmetics since 1 March 2022.
If you are not yet sure your flakes are dandruff at all, start with dandruff explained, then dandruff, dry scalp or leftover product. This article picks up from there: what each active is, what the sources say it does, how the EU classifies it, and where it is usually sold. It is a guide to reading labels, not medical advice.
- 1. Why the active ingredient is the whole story
- 2. Every active at a glance
- 3. The antifungals you can find in cosmetic shampoos
- 4. Salicylic acid: aimed at the scale
- 5. The ones sold as medicines: ketoconazole and coal tar
- 6. Zinc pyrithione: no longer allowed
- 7. How to read an anti-dandruff label
- 8. Why rotating actives is sometimes suggested
- 9. Where Rinsed fits, and where it does not
- 10. When to ask a pharmacist or doctor
- 11. Summary
- 12. Frequently asked questions
- 13. Sources
Why the active ingredient is the whole story
Dandruff is a scalp condition, and a plain cleanser does not treat it. The NHS names a yeast that lives naturally on the skin as one cause, and says stress and cold weather may make it worse. DermNet identifies that yeast as Malassezia, which breaks down the oils in sebum, and describes dandruff as an uninflamed form of seborrhoeic dermatitis on the scalp.
That gives anti-dandruff ingredients two broad jobs. Antifungals reduce the growth of Malassezia. Keratolytics loosen and remove the scale. Everything else in the bottle, the surfactant, the fragrance, the conditioners, is there to wash your hair and make the product pleasant to use. So the useful question on any pack is not "does it say anti-dandruff?" but "which active is in it?"
Every active at a glance
Here is each active, what the sources say it does, how EU rules treat it and where you are likely to find it. Where the answer depends on the country, the table says so.
| Ingredient | What it does | EU status | Where it is usually sold |
|---|---|---|---|
| Climbazole | Anti-dandruff agent, also used as a preservative | Allowed in cosmetics. Annex III lists it as an anti-dandruff agent in rinse-off shampoo, up to 2.0% (entry 310) | Can be sold as a cosmetic, so wherever shampoo is sold. Varies by country |
| Piroctone olamine | Antimicrobial with an anti-dandruff function listed by COSMILE, the ingredient database run by the industry association Cosmetics Europe | Allowed in cosmetics. Listed as a preservative in Annex V, with limits | Can be sold as a cosmetic. Varies by country |
| Selenium sulfide (selenium disulphide) | Antifungal, reduces Malassezia | Allowed in cosmetics. Annex III restricts it to anti-dandruff shampoos, with a label warning | Varies by country, ask a pharmacist |
| Salicylic acid | Keratolytic, helps remove scale | Allowed in cosmetics. Annex III sets limits and conditions | Can be sold as a cosmetic. Varies by country |
| Ketoconazole | Antifungal medicine | Sold as a medicine in the UK; elsewhere, ask a pharmacist. | In the UK, pharmacies and shops, and on prescription. Elsewhere, ask a pharmacist |
| Coal tar | Reduces scaling | Prohibited in cosmetics (Annex II). Where available, a medicine | Varies by country, ask a pharmacist |
| Zinc pyrithione | Antifungal | Prohibited in cosmetics since 1 March 2022 | Not in EU cosmetic shampoos |
The table describes, it does not rank. None of these is "the best" in general, and which one suits a given scalp is a question for a pharmacist, not a blog.
The antifungals you can find in cosmetic shampoos
Three antifungal actives are allowed in EU cosmetic products, each under conditions set out in the annexes of Regulation (EC) No 1223/2009.
Climbazole
The EU's Scientific Committee on Consumer Safety concluded (SCCS/1600/18) that climbazole is safe as an anti-dandruff agent in rinse-off shampoo at up to 2%. Commission Regulation (EU) 2019/698 added it to Annex III specifically as an anti-dandruff agent in rinse-off shampoo, at up to 2.0% (entry 310). It is also listed in Annex V as a preservative, under separate limits.
Piroctone olamine
Piroctone olamine is listed in Annex V, the list of allowed preservatives, with maximum concentrations for rinse-off and other products. COSMILE, the ingredient database run by the industry association Cosmetics Europe, gives it an anti-dandruff function as well as a preservative one, which is why it turns up in anti-dandruff shampoos. You will see it on the ingredient list as Piroctone Olamine.
Selenium sulfide
Selenium sulfide is an antifungal that dermatology sources list for dandruff and seborrhoeic dermatitis. In the EU it appears in Annex III under the name selenium disulphide, restricted to anti-dandruff shampoos, and the label must warn users to avoid contact with the eyes or damaged skin. On an ingredient list it reads Selenium Sulfide.
Salicylic acid: aimed at the scale
Salicylic acid works on the flakes rather than the yeast. DermNet groups it with the keratolytics, which remove scale, and the NHS names it among the ingredients to look for in an anti-dandruff shampoo.
It is allowed in EU cosmetics under Annex III, amended by Regulation (EU) 2019/1966, which sets separate maximum concentrations for rinse-off hair products and for other products. The annex also states that it is not to be used in preparations for children under 3 years of age. It can also appear at a lower level as a preservative, so its presence alone does not tell you what a product is for. Read the claim on the pack together with the list.
The ones sold as medicines: ketoconazole and coal tar
Two of the most familiar dandruff actives come as medicines rather than cosmetics.
Ketoconazole
The NHS describes ketoconazole as an antifungal medicine that works by killing the fungus involved, and lists dandruff and seborrhoeic dermatitis among the uses of its shampoo. In the UK it says most ketoconazole shampoos can be bought in pharmacies and shops, and can also be prescribed. How it is sold in other countries varies, so ask a pharmacist where you live.
Coal tar
Coal tar is used to reduce scaling. Crude and refined coal tars are on Annex II, the list of substances prohibited in cosmetic products, after the EU's scientific committees concluded between 1995 and 2000 that crude and refined coal tars contain carcinogenic polycyclic aromatic hydrocarbons and are not safe in cosmetics (as recorded in SCCNFP/0646/03). Coal tar shampoos that exist are therefore medicines, and availability varies by country. The American Academy of Dermatology notes that some dandruff shampoos, such as those with coal tar, can make the scalp more sensitive to the sun.
A third medicine sometimes mentioned is ciclopirox. DermNet lists it with the antifungals and the AAD describes a ciclopirox shampoo as a prescription product in the US. Its status elsewhere varies, so it is a conversation for a doctor or pharmacist.
Zinc pyrithione: no longer allowed
For decades zinc pyrithione was the name on anti-dandruff labels. It has been prohibited in EU cosmetic products since 1 March 2022. Commission Regulation (EU) 2021/1902 added it to Annex II and deleted its old Annex III and Annex V entries. Advice that still recommends it usually predates the ban or comes from outside the EU. The full story, and what replaced it, is in why zinc pyrithione was banned in the EU.
How to read an anti-dandruff label
Where the active appears depends on whether you are holding a cosmetic or a medicine.
- Cosmetic shampoo. The active sits in the ingredient list on the back, written in INCI, the standard naming system: Climbazole, Piroctone Olamine, Selenium Sulfide, Salicylic Acid. The list runs in descending order of weight down to one percent, then in any order, so an active can sit well down the list and still be doing the work.
- Medicine. The active substance is named on the front of the pack, usually with its strength, and there is a patient leaflet inside with directions. Follow those directions.
- INCI name vs common name. Selenium sulfide and selenium disulphide are the same substance, the first being the INCI spelling and the second the name used in the EU annex. Zinc pyrithione appears on lists as Zinc Pyrithione.
- Look alikes. A name that merely resembles an active is not one. Amyl Salicylate, a fragrance ingredient named in Commission Regulation (EU) 2023/1545, is not salicylic acid.
For the general skill of reading a list, see what is in a shampoo bar and sulphate free, soap free, syndet.
Why rotating actives is sometimes suggested
Some dermatologists suggest alternating between shampoos with different actives, and the sources frame it cautiously. The AAD's dandruff advice says that if one shampoo does not work, you can try alternating between dandruff shampoos with different active ingredients. Its seborrhoeic dermatitis page adds that some people find a shampoo stops working as well as it did, that they should tell their dermatologist, and that rotating may help. The NHS puts it more simply: you might need to try more than one type to find one that works for you.
None of that is a schedule, and this article does not offer one. If you are thinking of switching or alternating, a pharmacist can tell you how to use each product.
Where Rinsed fits, and where it does not
Rinsed bars contain no anti-dandruff active. None of the actives in this article appears on either bar's ingredient list, and we make no claim that the bars help with dandruff. If you have dandruff, use a product that contains an active made for it and follow its directions.
What a Rinsed bar is, is an everyday cleanser: one bar for hair, body and face, with no bottle.
Shampoo, body and face wash, all in one bar. Cooling, refreshing and designed for those always on the go.
Rinsed bars are syndets with no saponified oils, and it is soap that forms soap scum with the calcium and magnesium in hard water. That is a statement about the ingredient list, not a promise about your scalp. Whether hard water has anything to do with flakes is a separate question, covered in does hard water cause dandruff. If your flakes seem to follow the gym or the seasons, see dandruff and sweat and dandruff in winter.
When to ask a pharmacist or doctor
A pharmacist is the right first stop for choosing between actives, and a doctor is the right stop when things do not settle. The NHS says to see a GP if you still have symptoms after using an anti-dandruff shampoo for at least four weeks, if your dandruff is bad or your scalp is very itchy, or if your scalp is red or swollen.
- Flaking that persists or keeps coming back
- Redness, swelling, soreness or pain
- Patches that spread beyond the scalp
- A reaction to a product: stop using it
The AAD adds that a dermatologist can tell whether flaking is a sign of another condition, such as seborrhoeic dermatitis, psoriasis, a fungal infection of the scalp or eczema. Ask before using any active on a child, and check the label: the EU rules say salicylic acid is not to be used in preparations for children under 3.
Summary
An anti-dandruff shampoo is defined by its active. In the EU, climbazole, piroctone olamine, selenium sulfide and salicylic acid can appear in cosmetics under conditions set in the annexes. Ketoconazole shampoos are sold as medicines in the UK, coal tar shampoos are medicines, and coal tar is banned from cosmetics outright. Zinc pyrithione has been prohibited in EU cosmetics since 1 March 2022.
Find the active in the INCI list on a cosmetic, or on the front of the pack on a medicine, and follow the product's directions. Rinsed bars contain no anti-dandruff active. Anything persistent, severe, red, sore or spreading is a question for a pharmacist or doctor.
Frequently asked questions
What is the active ingredient in anti-dandruff shampoo?
It depends on the product. In the EU, cosmetic anti-dandruff shampoos may contain climbazole, piroctone olamine, selenium sulfide or salicylic acid. Ketoconazole shampoos are sold as medicines in the UK, and coal tar shampoos are medicines. The active is named in the ingredient list on a cosmetic, or on the front of the pack on a medicine.
Is ketoconazole shampoo a cosmetic or a medicine?
It is sold as a medicine in the UK; elsewhere, ask a pharmacist. The NHS describes ketoconazole as an antifungal medicine, and in the UK most ketoconazole shampoos can be bought in pharmacies and shops or obtained on prescription.
Is zinc pyrithione banned in the EU?
Yes, in cosmetic products. Commission Regulation (EU) 2021/1902 added it to the list of prohibited substances with effect from 1 March 2022, so it should no longer appear in cosmetic shampoos sold in the EU.
Is selenium sulfide the same as selenium disulphide?
Yes. Selenium Sulfide is the INCI name you will see on an ingredient list, and selenium disulphide is the name used in the EU cosmetics annex, which restricts it to anti-dandruff shampoos and requires a warning to avoid contact with the eyes or damaged skin.
Should I rotate anti-dandruff shampoos?
The AAD suggests that if one shampoo does not work, you can try alternating shampoos with different active ingredients, and that rotating may help if a shampoo stops working as well. Ask a pharmacist or dermatologist before building a routine around it, and follow each product's directions.
Do Rinsed bars contain an anti-dandruff ingredient?
No. Rinsed bars are everyday cleansers and contain none of the actives in this article. If you have dandruff, use a product that contains an active made for it, follow its directions, and see a pharmacist or doctor if it does not improve.
Sources
The facts in this article are based on the sources below, checked in September 2026.
- Dandruff. NHS.
- Seborrheic dermatitis: Causes and treatment. DermNet, 2024.
- Regulation (EC) No 1223/2009 of the European Parliament and of the Council of 30 November 2009 on cosmetic products (recast). Official Journal of the European Union, 2009.
- Addendum to the scientific Opinions on Climbazole (P64), SCCS/1600/18. Scientific Committee on Consumer Safety, European Commission, 2018.
- Commission Regulation (EU) 2019/698 of 30 April 2019 amending Annexes III and V to Regulation (EC) No 1223/2009 of the European Parliament and of the Council on cosmetic products. Official Journal of the European Union, 2019.
- Piroctone Olamine: Ingredient. COSMILE Europe.
- Commission Regulation (EU) 2019/1966 of 27 November 2019 amending and correcting Annexes II, III and V to Regulation (EC) No 1223/2009 of the European Parliament and of the Council on cosmetic products. Official Journal of the European Union, 2019.
- Ketoconazole. NHS, 2024.
- About ketoconazole. NHS, 2024.
- Opinion of the Scientific Committee on Cosmetic Products and Non-Food Products Intended for Consumers concerning Wood Tars and Wood Tar Preparations, SCCNFP/0646/03, final. SCCNFP, European Commission, 2003.
- How to treat dandruff. American Academy of Dermatology, 2023.
- Seborrheic dermatitis: Diagnosis and treatment. American Academy of Dermatology.
- Commission Regulation (EU) 2021/1902 of 29 October 2021 amending Annexes II, III and V to Regulation (EC) No 1223/2009 of the European Parliament and of the Council as regards the use in cosmetic products of certain substances classified as carcinogenic, mutagenic or toxic for reproduction. Official Journal of the European Union, 2021.
- Commission Regulation (EU) 2023/1545 of 26 July 2023 amending Regulation (EC) No 1223/2009 of the European Parliament and of the Council as regards labelling of fragrance allergens in cosmetic products. Official Journal of the European Union, 2023.
- What ions cause hardness in water? Royal Society of Chemistry.
