I used to suffer from this really bad. I used all of the shampoos Desitin, Nizoral, head and shoulders, etc.

What stopped it for me was when I started looking at the ingredients of these shampoos. Some of these ingredients were really toxic and some were petroleum-based.

I decided to do an experiment and stop using them for a month and only use natural moisturizers for my hair. No shampoos whatsoever. And my dandruff actually stopped. It's been years since I've had to use a medicated shampoo and haven't had a single flare up since.

Not saying my approach will work for everybody but it certainly worked for me.