I’ve used this during several bleach sessions and my client’s hair feels noticeably stronger right after rinsing, not mushy like with other additives. The professional-strength concentrate means a little goes a long way, so the bottle lasts through many services.
The mixing ratio is so straightforward that even my first time adding it to lightener felt foolproof, and my client’s hair came through the service noticeably stronger. I’ve already reordered for my whole back-bar kit.
Used this during a full bleach and tone service and the hair came out with way more integrity than I'm used to seeing. A little goes a long way when you mix it into the lightener, so the bottle lasts through quite a few appointments. It's become a staple in my kit for any chemical service now.