The Dandruff Fix Dermatologists Actually Recommend

The biggest misconception about dandruff is that it's dry scalp. For most people, it's the opposite: a naturally occurring yeast called Malassezia feeds on scalp oil and triggers flaking and itch. That's why slathering on more moisturizing conditioner rarely helps — you're feeding the problem.

The ingredient with the strongest evidence is ketoconazole, an antifungal. In a multicenter randomized trial, 2% ketoconazole shampoo improved total dandruff severity by 73% and had a lower recurrence rate than zinc pyrithione. Against placebo, roughly 88% of ketoconazole users improved or cleared, versus 44% on placebo.

How to use it: this is a treatment, not a daily shampoo. Use it about twice a week — lather, then leave it on the scalp for 3–5 minutes before rinsing so the active has time to work. On other days, use your normal shampoo.

Once it's under control, many people drop to once a week or every other week to keep flakes away. If an antifungal shampoo doesn't help after a month, that's the sign to see a dermatologist — persistent scalp issues can have other causes.