"Water is good for you. But not so great for your hair. The calcium in your shower water can lead to persistent hair damage leaving it rigid, dull & brittle. This innovative dual action formula removes calcium buildup that causes damage and reconnects broken links between keratin chains for less breakage. Intensely hydrates for stronger, smoother and shinier hair while repairing persistent damage. Benefits: This innovative dual action formula removes calcium buildup that causes damage and reconnects broken links between keratin chains for less breakage. Intensely hydrates for stronger, smoother and shinier hair while repairing persistent damage. Benefits: Formulated with Citric Acid to deeply eliminate calcium buildup and Glycine to reconnect broken links between keratin chains, dramatically reducing breakage.​ Additional Benefits: Restores up to 99% of hair’s original strength*, 73% more shine**, 2X smoother hair**, 93% stronger*** *with continuous use of the full system **vs. unwashed hair ***vs. non conditioning shampoo Suggested Use: Apply on wet hair, layered on top of Première Pre-Shampoo Treatment. Massage and emulsify. Rinse thoroughly. Follow with Première Repairing Conditioner or Repairing Mask. Kerastase Premiere Collection: Dual action repair haircare for stronger hair inside & out Brand: KÉRASTASE Manufacturer: Kerastase ASIN: B0CS1T67WS Product Benefits: A sulfate-free repairing shampoo that gently cleanses, repairs bonds and removes calcium build-up for stronger and healthier hair. Product Dimensions: 1.93 x 2.8 x 5.59 inches; 10.55 ounces"