Fine, thin hair instantly gains major mass, guts and volume from Color Wow Carb Cocktail Bionic Tonic, a ground-breaking leave-in “bionic tonic” supplement. Chemicals in hair colour cause three major problems, and one of them is loss of proteins that give hair strands natural thickness and body. If you want to bulk up skinny strands, simply apply Carb Cocktail after you shampoo and condition, then heat style. Color Wow is a cruelty-free brand; they do not test any of their products on animals.