A couple of days back I discovered that my dandruff had come back after a hiatus of several years. So I mixed up this little treatment that is an old stand-by. A couple of applications and my dandruff is almost gone!
What you are making is basically a tisane. You pour a cup of boiling water over the herbs and let them steep. I used a teaspoon each of the following herbs:
Other herbs that work against dandruff are rosemary, liquorice, ivy, horsetail, nettles, burdock and silver birch. If you live in a completely different climate zone, I encourage you to research into the traditional remedies for dandruff.
I recommend using maximum three herbs at a time, so that in case on of them has unwanted side-effects you can easily single out the culprit.
Let me know if these work for you. If you have questions, I'm happy to answer!