Wella Ultimate Repair Step 1 Shampoo gently cleanses the hair while also helping to repair damage. In fact, this formula is enriched with Alpha-Hydroxy Acid (AHA) and Omega-9 to deliver dual-action repair. So, AHA penetrates deep into the hair cortex, where it helps rebuild internal bonds. Meanwhile, Omega-9 restores the outer layer by sealing the cuticle and reinforcing the hair’s protective barrier. Additionally, the Metal Purifier technology helps remove metal deposits from the hair. Because of this inside-out approach, the hair becomes up to 12 times smoother while damage from heat and chemical treatments is repaired.