K18 Damage Shield PH Protective Shampoo 930 ml/ 31.5 fl oz Professional sizeK18 DAMAGE SHIELD ph protective shampoo, formerly known as PEPTIDE PREP pH maintenance shampoo, is a cleansing shampoo with optimized pH level to cleanse frequently without disturbing hair and scalps optimal pH levels. Perfect for use within the K18 molecular repair routine. Features & Benefits: Creates the ideal foundation for healthy hair: Protects pH balance to keep the cuticle closed during washing and protect hairs natural moisture levels