Gaaah! Why didn't I share this earlier!
I hope this works for you just how it did for me!
ROSEMARY OIL! Your hair is itchy, you get some rosemary oil onto those itchy bits and by the next day, voila! itching stops! It also stops dandruff that quick too. Isn't that great? I really like it now, but I don't use it as often as I use olive oil.
Anyways, I make my own rosemary oil so I'm sure it's 100% natural (I like using 100% natural things...healthy). The first time I made rosemary oil, I put some dried rosemary into a clear bowl, I then added a bit of water to it and a drop of olive oil (covered the bowl) then I kept it by a window to get at least 2 days of sunshine then voila! I had oil in the bowl and it didn't look like the water, rosemary thingy it did the day I made it. Nowadays, I don't bother adding drops of olive oil to it. I just get the rosemary and water, leave it by a window for at least 2 days of sunlight and voila! My mum has asked me to make some rosemary oil for her because it works wonders with itchy scalp and it prevents dandruff.
Also, a good way you can use rosemary oil is by getting it into your hair (don't bother if the leaves get in too, they'll fall come out later) and then getting some 100% natural shea butter into your hair too. You can mix them together and get it in all at once, but when I use SB too, I get the RO in first then the SB.
Hope this works for you too!