The luxury brand, Mevys® is No.1 selling Keratin Treatments because it works! Mevys Professional Keratin Line has been developed based on hair characteristics, as thickness and porosity. It contains Keratin, collagen, silk aminoacids and natural proteins from wheat, rice, soy and silk. This unique combination of proteins with different molecular sizes allows the smallest proteins to penetrate deep within the cortex and repair while the largest proteins act to seal the cuticle. Hair is repaired from the inside-out. Original keratin: soft for fine hair. Peach keratin: regular for colored hair and highlights. Chocolate Keratin: strong for thick and virgin hair. Lemon-lime: extra strong for tight curly hair.