Last one available! myBoostars Keratin Damage Repair Citrus Savon Scent ・Shampoo Refill 350ml ・Treatment Refill 350ml Formulated with hydrolyzed keratin, this booster shampoo is born from skincare principles. It repairs damage and leads to supple, shiny hair. Pursuing the ideal finish and feel, it uses hair repair ingredients used in salons. By replenishing keratin, the main component of hair, it gives hair firmness and body, leading to supple hair.