K18 Leave-In Molecular Repair Hair Mask — 0.5 fl oz peptide treatment for bleached, color and heat-damaged hair, 4-minute repair

K18 Leave-In Molecular Repair Hair Mask is a 4-minute peptide treatment that repairs and strengthens damaged hair without rinsing.

This concentrated leave-in mask uses K18PEPTIDE™ technology to reconnect hair’s internal structure after chemical, thermal, or mechanical damage. Designed for use on clean, towel-dried hair, the lightweight formula sinks into the inner cortex to improve elasticity, smoothness, and manageability in minutes. It’s suitable for all hair types and textures and is formulated to deliver visible improvement after just a few applications.

How does the K18 mask work on chemically treated or bleached hair?

The formula contains a biotech-developed peptide that interacts with the hair’s keratin to restore integrity at the molecular level rather than only coating the surface. This helps rebuild bonds that contribute to tensile strength and flexibility along the strand. Results include reduced breakage and a softer feel, with benefits compounding over several uses.

• Patented peptide targets inner hair structure, not just the cuticle.
• Supports recovery after bleach, color, and chemical services.
• Can reduce visible damage and improve strand elasticity.

What is the correct way to use this 0.5 fl oz leave-in mask?

Start with clean, towel-dried hair and skip your regular conditioner before applying. Dispense 1–3 pumps depending on hair length and porosity, distribute evenly, leave for four minutes, and do not rinse; then style as usual. Use consecutively for several washes to jump-start repair, then apply as needed for maintenance.

• Apply to damp, shampooed hair only — do not rinse out.
• Adjust amount: 1 pump for short hair, 2–3 for mid to long lengths.
• Use 4–6 washes in a row for initial improvement, then periodically.

Will this product work for curly, coily, or textured hair?

Yes—because the peptide acts within the hair fiber, the treatment is effective across curl patterns and textures. Rather than relying on surface conditioning alone, it focuses on rebuilding internal strength so coils and curls retain definition and elasticity. Many users notice easier detangling and improved bounce after a few applications.

• Helps improve manageability for tight coils and loose waves.
• Reduces tangling and increases slip for combing or styling.
• Non-rinse format preserves curl pattern without weighing hair down.

How quickly will I see results, and how long do effects last?

Visible changes can appear after 2–3 uses, with immediate improvements in softness and reduced frizz following a single 4-minute treatment. The rebuilding action is cumulative, so initial consecutive treatments are recommended. Longevity depends on styling, chemical services, and wash frequency; follow-up uses maintain and refresh the repaired structure.

• Noticeable softness and strength after just a few applications.
• Immediate 4-minute treatment provides same-day manageability gains.
• Maintenance applications prolong the repaired condition.

Who is this for: This compact 0.5 fl oz K18 leave-in mask is intended for anyone seeking targeted repair for hair weakened by color, heat, chemical processing, or daily styling. It’s a convenient trial or travel size for those wanting to strengthen brittle ends, smooth frizz, or rebuild elasticity without heavy conditioners. Suitable for all hair textures, this formula is a quick step for users who prefer leave-in treatments that integrate easily into a styling routine.

Ingredients

Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20,sh-Oligopeptide-78 (K18PEPTIDE™), Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.