ClassicFilms

No I remember what it was. Head & Shoulders is a better known dandruff shampoo name, but generally uses zinc pyrithione. They used selenium (sulfide?) in the movie and generally H&S doesn't use that as an active ingredient, but Selsun Blue does.

I know this because I used to have dandruff. Then there's the third option active ingredient, salicylic acid, which Denorex was good for.

Each active ingredient targets different causes for dandruff. If you have dandruff, you should figure out what your cause is, because it's possible you're mistreating your scalp.