By Dr. Shweta Lamba Narula,
The short answer: Dandruff is caused by an overgrowth of Malassezia, a yeast that lives on all scalps but proliferates when sebum levels are high and causes the inflammation and flaking associated with seborrheic dermatitis. The best dandruff shampoo contains an active antifungal. Ketoconazole 2% is the most studied, with a 73% improvement in dandruff severity versus 67% for zinc pyrithione 1% in direct comparison. Use it twice weekly consistently, leave it on the scalp for 3 to 5 minutes before rinsing, and expect visible improvement in 3 to 4 weeks.
The shampoo aisle has a dandruff section that is longer than it needs to be. Most of what is in it, gentle scalp balancing and nourishing formulas for a healthy scalp, is not meaningfully antifungal. The best shampoo for dandruff is the one that addresses Malassezia directly. Everything else is management of symptoms without treating the cause.
What actually causes dandruff?
Dandruff and seborrheic dermatitis are points on the same spectrum. Dandruff is the milder end: white or yellow flakes, some scalp itch, no significant inflammation. Seborrheic dermatitis is the more severe end: visible redness, significant scaling, and itch that disrupts daily life.
The underlying cause of both is Malassezia, a genus of lipophilic (fat-loving) yeast that is part of the normal scalp microbiome. Malassezia feeds on sebum, breaking down triglycerides and releasing free fatty acids. These fatty acids penetrate the scalp epidermis and trigger an inflammatory response in susceptible individuals, causing accelerated skin cell turnover, which produces the visible flakes.
Dandruff is not caused by dryness, poor hygiene, or infrequent shampooing. It is caused by the immune system's response to Malassezia on a sebum-rich scalp. This distinction matters because it defines what the treatment needs to do: reduce the Malassezia population, not just cleanse the scalp more frequently.
Which active ingredients in dandruff shampoos actually work?
Ketoconazole (1–2%): An azole antifungal that inhibits ergosterol synthesis in Malassezia cell membranes, disrupting the yeast's ability to maintain cellular integrity. A randomised trial found ketoconazole 2% shampoo showed a 73% improvement in dandruff severity scores compared to 67% for zinc pyrithione 1%. It is the most potent antifungal available in an OTC or near-OTC shampoo format in India.
Zinc pyrithione (ZPT, 1–2%): One of the most widely used anti-dandruff actives globally. Works by inhibiting iron-sulphur cluster synthesis in Malassezia restricta, disrupting the yeast's metabolic function. Effective for mild to moderate dandruff; slightly less potent than ketoconazole in head-to-head comparison but well tolerated with fewer restrictions on frequency of use.
Selenium sulphide (1–2.5%): Antifungal with additional anti-seborrhoeic properties (reduces sebum production). Effective but can cause discolouration in chemically treated or greying hair. Less commonly used now that ketoconazole is widely available.
Salicylic acid (1–3%): A keratolytic that breaks down the scale and flaking layer rather than targeting the yeast directly. Useful in combination with an antifungal for very thick scaling but not sufficient as a standalone dandruff treatment.
Piroctone olamine: An alternative antifungal active, often used in combination with salicylic acid. Evidence supports efficacy in reducing Malassezia and flaking.
Botanical and non-synthetic actives: Australian tea tree oil (Melaleuca alternifolia) has demonstrated antifungal properties against Malassezia at effective concentrations, often combined with salicylic acid as a keratolytic to break down the flaking layer. This is a different active approach from ketoconazole or ZPT, with lower potency head-to-head but better tolerated for regular use. Biotin shampoos, protein-enriched scalp shampoos, and pH-balancing formulas without any antifungal active do not address the underlying cause of dandruff.
Which shampoos are best for dandruff in India: 4 picks
Pilgrim Australian Tea Tree Non-Drying Anti-Dandruff Shampoo: Best for regular non-drying scalp treatment. Uses Australian Tea Tree oil for its antifungal properties against Malassezia, combined with Salicylic Acid as a keratolytic to break down scaling and clear the follicle opening. The non-drying formula makes it suitable for more frequent use than synthetic antifungal shampoos. Pilgrim's consumer panel data (brand-reported, not an independent clinical trial) indicates visible reduction in flaking within the first 3 to 4 weeks of consistent use.
Head & Shoulders Classic Clean: Best widely accessible maintenance option. Contains zinc pyrithione at 1%. Effective for mild dandruff with daily or near-daily use. The 30-year track record makes it one of the most validated anti-dandruff shampoos available.
Nizoral 2% Ketoconazole Shampoo: Best for moderate-to-severe dandruff. 2% ketoconazole, the highest potency OTC-accessible antifungal shampoo. Use twice weekly for active dandruff, then once a week for maintenance.
Selsun Blue Medicated: Best for oily scalp with heavy dandruff. Selenium sulphide 1%, which also reduces sebum production alongside antifungal action. Not suitable for chemically treated hair.
How do you use a dandruff shampoo correctly?
Most people use anti-dandruff shampoo incorrectly. They apply it, lather, and immediately rinse. This gives the active compound insufficient scalp contact time to reduce Malassezia.
Correct protocol:
- Wet hair thoroughly
- Apply Pilgrim Australian Tea Tree Anti-Dandruff Shampoo to the scalp (not the hair length)
- Lather and massage into the scalp
- Leave on the scalp for 3 to 5 minutes. This is essential.
- Rinse thoroughly
- Use twice weekly; on other days, use your regular shampoo
Medicated and antifungal shampoos are generally designed for twice-weekly use; once weekly for maintenance after dandruff clears. The Australian Tea Tree formula's non-drying design allows for slightly more flexible use frequency. Follow the label guidance. Daily use of any active shampoo can disrupt the scalp microbiome over time.
When should you see a dermatologist about dandruff?
A ketoconazole or zinc pyrithione shampoo used correctly resolves most dandruff within 4 to 6 weeks. If it does not, there may be something else going on.
See a dermatologist if:
- Dandruff does not improve after 4 to 6 weeks of correct use of a medicated shampoo
- There is significant scalp redness, thick crusting, or oozing
- The condition is spreading to the face, ears, or chest (seborrheic dermatitis can affect other sebum-rich areas)
- Hair loss accompanies the dandruff (scalp inflammation can accelerate shedding)
Prescription-strength treatments including topical corticosteroids and higher-concentration antifungals are available and effective for cases that do not respond to OTC actives.
Common mistakes when treating dandruff
Using a "gentle" or "natural" shampoo instead of an antifungal one. Marketing language around scalp balance and gentle cleansing does not translate to Malassezia reduction. If your dandruff is coming from yeast overgrowth, the treatment must be antifungal.
Rinsing too quickly. Contact time is what allows the antifungal active to act. A 10-second rinse reduces efficacy significantly.
Using an anti-dandruff shampoo only when dandruff is visible. Dandruff is cyclical. Malassezia populations rebound. Maintenance use (once a week even after symptoms clear) prevents recurrence.
Assuming dandruff means dry scalp and adding more oil. Hair oiling on a Malassezia-prone scalp can worsen dandruff. The yeast feeds on sebum and fatty acids. Heavy oiling is counterproductive for active dandruff.
Using conditioner on the scalp. Conditioner on the scalp seals in moisture and creates an environment that supports Malassezia growth. Apply conditioner to hair lengths only.
Frequently asked questions
What is the best shampoo for dandruff in India?
The best dandruff shampoo contains an active antifungal. Ketoconazole 2% is the most potent and well-studied option for reducing Malassezia, the yeast that causes dandruff. Zinc pyrithione 1–2% is an effective alternative with a good tolerability profile. Shampoos without one of these actives will cleanse the scalp but will not meaningfully reduce dandruff caused by yeast overgrowth.
Is dandruff caused by dryness or fungus?
Dandruff is primarily caused by Malassezia, a yeast that lives on all scalps and proliferates on sebum. When Malassezia overgrows, it triggers an inflammatory response that causes accelerated skin cell turnover and flaking. Dry scalp produces small, white flakes without significant itch or oil; dandruff typically produces larger, yellowish flakes on an oily scalp. The treatment approaches differ: dandruff requires an antifungal shampoo, while dry scalp responds to moisturising care.
How often should you use anti-dandruff shampoo?
For active dandruff, twice weekly is the standard protocol for ketoconazole-based shampoos. On the other days, use your regular shampoo. Once dandruff resolves, once-weekly use maintains the result. Daily use of medicated shampoos is not recommended.
How long does it take for anti-dandruff shampoo to work?
With correct use, leaving the shampoo on the scalp for 3 to 5 minutes twice weekly, visible reduction in flaking typically occurs within 3 to 4 weeks. Full clearance of dandruff may take 6 weeks. If there is no improvement after 6 weeks of correct use, see a dermatologist.
Can dandruff cause hair loss?
Dandruff itself does not directly cause permanent hair loss. However, the scalp inflammation associated with seborrheic dermatitis, particularly if itching leads to scratching, can increase shedding. Treating the dandruff resolves the associated scalp irritation and typically reduces that shedding. If hair loss is significant or continues after dandruff clears, a separate evaluation for hair loss causes is warranted.
Can you use a hair growth serum if you have dandruff?
Treat the dandruff first. Active dandruff, with scaling, inflammation, and compromised scalp barrier, reduces absorption of topical actives and creates an environment that is not conducive to follicle health. Once dandruff is controlled with a medicated shampoo, adding a Pilgrim hair growth serum to the routine is appropriate and beneficial.
References
- Seborrheic Dermatitis and Dandruff: A Comprehensive Review. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC4852869/
- Ketoconazole Shampoo for Seborrheic Dermatitis of the Scalp: A Narrative Review. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC11416180/
- Understanding the Mechanism of Action of the Anti-Dandruff Agent Zinc Pyrithione against Malassezia restricta. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC6092343/
- Scalp Seborrheic Dermatitis and Dandruff Therapy Using a Herbal and Zinc Pyrithione-based Shampoo and Scalp Lotion. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC5788265/
- A Cohort Clinical Study on the Efficacy of Topical Salicylic Acid/Piroctone Olamine Dandruff Pre-Gel and Cleanser. PMC. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC11705510/
- Seborrheic Dermatitis: Causes and Treatment. DermNet. https://dermnetnz.org/topics/seborrhoeic-dermatitis
