Miracle Elixir Booster consists of the most sophisticated mix of keratin- it mimics hair's natural keratin and repairs damaged hair from the inside out. It can be added to any of Keune's 5 Care hair masks. Features & Benefits: A reduction of internal hair damage of up to 80%. Hair that’s twice as soft after just a single application. How to Use: Combine Miracle Elixir Concentrated Keratin Booster with a hair mask specifically designed to address the unique hair concern.