I used this to redye my hair. I had damaged it using a mainstream brand (but I fell in love with the colour and ignored logic). 3 massive surprises when using BioMagic: 1. It actually helped to heal my hair (total shock!!) 2. I didn't use a fan in the bathroom when putting the biomagic through ... for the first time dying my hair, no headache from fumes, didn't burn my scalp, it was an actually pleasant smell (!!!) 3. I thought, because of the lack of nauseating smell, it wouldn't last ... guess again! It has lasted longer in my hair then any other brand has! I often get these little stubborn spots that just won't colour, however, biomagic gave me full coverage 😍 I have a second box waiting to go, when i feel like dying my hair again. For me, I won't touch another hair colouring brand since using biomagic 🥰