I would definitely not recommend using INOA. The first time my hairdresser used it on me my roots were bright red - she had to apply semi permanent over the top to correct it. The following two times I used it I had no real complaints, although suspected that my hair had become a little thinner. I lastly had my hair coloured with INOA a few days ago and I immediately noticed that my hair looked extremely thin on top - I am horrified that I can see my scalp at the front of my head - and I have - or at least HAD extremely thick hair. The dye was only applied primarily to the roots and that is where the damage is. My scalp is also hot and itchy and irritated and I've never had a reaction to any sort of hair dye before. I am so worried about how to restore the quality of my hair so that I don't look thinning on top - which is what I look like now! I will certainly NEVER be using INOA again and I do not recommend that anyone else uses it. I can also vouch for the unreliaility in colour outcome - my hair is much redder this time, while I am sure my stylist would've mixed it in exactly the same way. I should have avoided INOA after the first awful reaction, but my stylist persuaded me that she could correct for the first bad outcome - which she said had happened to a few clients but not everyone. Do not take the risk with your hair unless you want to look half bald like me. My hair just looks incredibly thin where it was once thick. Avoid this product like the plague!