A few years ago I was turned onto this stuff in a salon in Beverly Hills. I recently used it again and forgot how absoutely amazing it is. If you have really damaged hair, it’s the best. It literally transforms your hair. I’ve never used anything like it. For every day stuff I’ve been using the Pureology line for a while and love that. But when you need a deep conditioner treatment, there’s nothing better than the Kerastase Mask.