I must say firstly, a friend gave me a pack of this as she had a reaction to it and thought it a shame to waste it. Blisters on her neck mainly. I've also heard recently of another friend having a similar problem. They both had to see the doctor. Having got that out the way, I,m finding it great. Normally hair colourants burn my scalp and cause all sorts of weird spots on my scalp and neck. Once I'd tried it I found it so much better on my scalp. Even 10 minute colours were giving me trouble previously. I decided to continue using it and was pleased to find some available through good old Amazon. The more times I've used it the better my scalp has felt and I've not had any rash on my neck either. Had several comments on how lovely my hair is looking too. From both men and women. Anyway, I do recommend it but do the allergy test first if you're prone to any problems just to make sure.