Maybe its the argan oil making it itchy, it doesnt do for everybody and neither do some hair dyes. My daughter in law recently had to change her brand of hair dye for this same reason. T gel is good as someone has already mentioned and diluted tea tree oil in a final rinse helps too, just a few drops in a large jug of warm water. When something irritates me and i`m not sure which product it is, I zero right back to absolute basics such as Simple shampoo and then reintroduce other products one at a time, use it for a few days to check it isn`t that product causing irritation and eventually I suss which one it is causing the aggro.