I'm not, since I don't have dandruff. But I do use tea tree oil. I doubt it affects hair loss, but it smells good and I already paid for it, so I'm enjoying the smell.
I just bought a 4oz bottle for $20 and use 3 drops in my baby shampoo. Very cheap. Well, I actually put 1/3 cap full in there, and that was WAY too much. It would not all dissolve, and it was WAY to strong. I managed to shake it up and get some of the concentrated stuff out. Now the rest is pretty good. It makes my scalp tingle and smells really good. Just don't get it in your eyes.