I used to have a pretty bad dandruff problem in my mid teens. Was advised by GP to use a non-commercial dandruff shampoo product (like from a Chemist/Pharmacist) as they are more natural and have less chemicals in them that are damaging to the hair/skin. Sorry, can't remember the name of the one i used, it was a fair few years ago now. I do remember it had a very strong, almost nauseating smell and it was a dark brownie beer-like colour (kinda like Guinness, sorry if mis-spelt, i don't drink alcohol), like the typical cough medicines you can get, you know, the ones that taste as bad as they look. Well this anti-dandruff shampoo smelt as bad as it looked. But it did the job! Worth pointing out, if i remember rightly, the bottle said to use it for 2 weeks and then after that to continue using Head & Shoulders anti-dandruff shampoo to finish off the job. The results were that i did just that and it worked well, i continued using the Head & Shoulders one until i finished the bottle, maybe 2 bottles (can't remember exactly), and then my dandruff was gone, just like that. Now, a few years later, i no longer have dandruff and i currently use a Radox shampoo (works very well for me so i'm sticking with it!) and all is fine! Good luck!