I have brunette hair that I had bleached and then dyed back to brunette. So, my hair gets brassy pretty quickly. I started using bedhead Dumb Blonde during my blonde phase and it really helped keep my hair cool and not brassy. I had some left over and decided to try it on my brown hair. It actually works to help cool down brunette hair! I use it a few times a week now. It takes alot more and more use to see the results on brown hair but it definitely helps.