K18 Biomimetic Hairscience Professional Leave-In Molecular Repair Mask 1.7 fl. oz

Leave-In Molecular Repair Hair Mask is a salon-grade, leave-in treatment that repairs hair on a molecular level in just4 minutes. Powered by the biotech-developedK18PEPTIDE™, the lightweight cream reconnects broken polypeptide chains (and, as a result, disulfide bonds) to restore strength, softness, smoothness and bounce across all hair types and levels of damage. pH-optimized to 5.0–6.0 to minimize cuticle swelling, the mask is applied to clean, towel-dried hair (use1–3 pumpsdepending on length and density), left on for4 minutes(do not rinse), then combed and styled; use for4–6 washesafter a salon service, then as needed for progressive, lasting repair. The formula is vegan, color-safe and cruelty-free.

Key benefits

• Reverses molecular damage by reconnecting polypeptide chains (K18PEPTIDE™) to rebuild core strength and elasticity. 
• Fast, leave-in protocol (4 minutes) for convenient salon or at-home use with progressive, lasting repair across washes.
• pH-optimized (5.0–6.0) to minimize cuticle swelling and place hair proteins in their most resilient state; cream format detangles and applies easily across all hair types.
  

Suitability
Vegan, color-safe and cruelty-free. Formulated for all hair types and clinically proven to repair damage caused by bleach + color, heat and chemical services when used as directed.

1. Shampoo, do not condition. Towel-dry thoroughly.
2. Apply 1–3 pumps of K18 leave-in molecular repair hair mask based on your length and density, starting at the ends and working up towards the roots.
3. Let sit for 4 minutes. Do not rinse out.
4. Comb, add product + style as usual. Use for 4–6 washes post-salon service, then as needed.

Dos & Don'ts (verbatim guidance from the page)

• DO clarify before K18 if you’re a heavy product user (demineralize for mineral + metal buildup).
• DO apply on clean, damp hair.
• DO wait the full 4 minutes before combing or styling.
• DO add whatever styling products you love after the 4 minutes.
• DO use for 4–6 shampoos consecutively for progressive results.
• DON'T use conditioner before applying K18 Mask (you can apply after the 4 min but most find they don’t need it).
• DON'T overdo it—less is more.
• DON'T rinse it out. 

Keep out of reach of children.