Treat your scalp like your face and you're most of the way there. Cleanse it, don't scrub it raw, and when a problem sticks around, give it a real active instead of a prettier bottle. The part nobody believes: a flaky scalp usually wants more washing, not less.
Scalp skin sits around pH 5.5 and has more sebaceous glands packed into it than your face does. That's why it gets greasy faster and why product residue piles up. It's also home to Malassezia, a yeast that lives quietly on most adult scalps. Dandruff is that yeast overgrowing and setting off inflammation. Hence the itch, and hence why a plain moisturizing shampoo does nothing for it.
Telling the usual suspects apart
What the scalp is showing, and what usually helps
| What you see | Most likely | What helps |
|---|---|---|
| Fine white flakes, mild itch, oil by day two | Dandruff, driven by Malassezia | An antifungal shampoo twice a week, and washing more often |
| Yellow greasy scale, redness at the hairline | Seborrheic dermatitis | A medicated shampoo on a schedule; a doctor if it does not settle |
| Thick silvery plaques past the hairline | Psoriasis, a medical condition | A doctor, because this is not a cosmetic problem |
| Burning and redness after a new product | Contact dermatitis, often from dye | Stop the product and patch test in future |
The actives with evidence behind them
- Ketoconazole 1 percent — An over-the-counter antifungal in the US and the best-studied option for dandruff. Use it twice a week and leave the lather on for three to five minutes before rinsing. The itch usually calms down before the flakes do.
- Zinc pyrithione — The active in most drugstore dandruff shampoos, at 0.5 to 2 percent. It's cheap and gentle enough for frequent washing, which suits a scalp that needs it every couple of days.
- Selenium sulfide — Worth a try when the first two stop working. It can shift the tone of dyed hair, so keep it on the scalp and rinse thoroughly.
- Salicylic acid — It dissolves scale rather than tackling the yeast, so pair it with an antifungal instead of swapping one for the other. Three percent is the usual over-the-counter strength.
Rotate your actives
Rotation is the practical move. Yeast populations adapt to a single agent over months. A schedule that pairs, say, ketoconazole twice a week with a zinc pyrithione shampoo on the other days tends to keep working much longer than either one alone.
What to leave on the shelf
Salt and sugar scrubs do more damage to an inflamed scalp than the scale they remove, and an antifungal shampoo does the same job chemically. The other common mistake is undiluted essential oil. Tea tree, peppermint and rosemary can all irritate at full strength, and a scalp reaction to an oil can take weeks to clear.
Rosemary oil's reputation rests largely on one trial. Panahi and colleagues, writing in SKINmed in 2015, gave 100 men with pattern hair loss either rosemary oil or 2 percent minoxidil for six months, 50 per group. Neither group changed at three months. Both gained hair count by six months, with no significant difference between them, and scalp itching was more common on minoxidil. There was no placebo arm, the comparator wasn't the stronger minoxidil many people use, and "no significant difference" isn't proof the two are equal. Interesting, not settled. For pattern hair loss, topical minoxidil is still the over-the-counter benchmark, and it only works while you keep using it.
Six scalp products worth the shelf space
Four contain a drug active, one is a gentle everyday cleanser and one is a tool. Prices are shown only where we confirmed them on the brand or retailer page in Oct 2026.
Best evidenceNizoral
Ketoconazole 1% Shampoo, 200ml
The reference product for a flaking, itchy scalp, and a drug rather than a cosmetic. Give it four weeks before deciding whether it has worked.
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Head and Shoulders
Classic Clean Shampoo, 400ml
Cheap enough to use as an ordinary shampoo, which is the point: a scalp that flakes benefits from washing every second day rather than once a week.
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Neutrogena
T/Sal Therapeutic Shampoo, 133ml
Dissolves built-up scale rather than treating the yeast, so it is a partner for an antifungal rather than a substitute. Best when the scalp feels crusted.
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Selsun Blue
Medicated Shampoo, 1% selenium sulfide
The rotation partner for ketoconazole when a single active stops holding its effect. Keep it on the scalp, since it can shift the tone of dyed hair.
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Vanicream
Free and Clear Shampoo, 355ml
For a scalp that reacts to scent rather than to yeast. Fragrance is one of the commonest causes of contact dermatitis on the scalp.
Check priceKitsch
Scalp Exfoliating Brush
A soft brush used to work shampoo along the scalp gets the active where it needs to be, without the abrasion a salt scrub causes.
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