My Boosters Keratin Booster Mist Hair Mist & Treatment Used only once. Purchased last week. Contains hydrolyzed keratin (*1), a hair-introducing beauty serum born from skincare concepts. Can also be used as a leave-in treatment. Repairs damage and leads to supple, shiny hair. Citrus savon fragrance. ● Hydrolyzed keratin-containing aqueous solution 5% (*2) ● Keratin Boost Repair Formula Micro Keratin (*1): Boosts (*3) to repair hair damaged by coloring and perms: Promotes (*4) the penetration of beauty serum ingredients (*1) into the hair.