K18 leave-in molecular repair hair mask 50ml4-minute leave-in treatment to clinically reverse hair damage.An at-home leave-in treatment infused with the patented K18Peptide™ that works to repair even the most extreme damage, renewing hair to its most youthful, healthy state.More info:This patented bioactive peptide treatment strengthens and improves elasticity while reversing damage from chemical services, thermal styling, and mechanical styling. For all hair types.Hair like new. This leave-in mask heals and strengthens hair with lightweight moisturizing benefits to detangle and keep hair smooth and soft, without weighing it down. For best results, use every 4-6 consecutive washes following a service.How to useShampoo, do not condition. Towel dry until damp.Begin with 1 pump of K18 Mask and add more as needed depending on the length, thickness, and condition. Work evenly into hair, one pump at a time, from ends to roots.Let sit for 4 minutes to activate.Do NOT rinse out. Style as usual.The dos & don'tsDO use a clarifying shampoo if you’re a heavy product or dry shampoo user.DO dry thoroughly with hair towel or turban before application.DO wait the full 4 minutes before styling or applying another product.DO use every 4-6 shampoos consecutively to see and feel the full results.DON’T condition your hair before applying K18.DON’T use too much.DON’T rinse it out.