Colour processing breaks down hair\'s natural, internal cysteine bonds which give each strand strength and resilience. Color Wow Kale Cocktail Bionic Tonic is a mega-force tonic with sulphur-rich sea kale helps relink and reinforce hair\'s vital internal bonds. Loaded with protein-building Amino Acids plus B Vitamins, this strand- strengthening super-power smoothes, de tangles and has been clinically proven to reduce breakage by over 50% after one single application. Helps guard hair against UV ray damage. Color Wow is a cruelty-free brand; they do not test any of their products on animals.