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K18 Biomimetic Hairscience - Mini Leave-in Molecular Repair Hair Mask 0.5 OZ


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4-minute leave-in treatment to reverse hair damage

A leave-in treatment mask for all hair types that clinically reverses damage in 4 minutes. The patented peptide technology repairs damage from bleach, color, chemical services & heat – restoring strength, softness, smoothness, and bounce to hair.



  • Bleach + Color
  • Heat
  • Chemical Services

The K18PEPTIDE™ works at the innermost layer of hair, reconnecting polypeptide chains and disulfide bonds broken during bleaching, chemical services, and through heat damage.

By addressing these damage sites at the innermost layer of hair, core strength, and elasticity are renewed for the firm, smooth, bouncy hair—even after the most extreme damage done in the salon or at home.

key benefits

  • It is powered by the patented K18PEPTIDE™, engineered over 10 years in a biotech lab to work on the molecular level to rebuild hair from the inside out in just 4 minutes.
  • Because the K18PEPTIDE™ works at the molecular level, it works on every single hair type
  • Clinically proven to reverse hair damage from Bleach + Color, Chemical Services, Heat
  • Restores strength, softness, smoothness, and bounce
  • Immediate + progressive results
  • Vegan, color-safe, cruelty-free

How To Use:

  1. Shampoo, do not condition.
  2. Towel-dry thoroughly.
  3. Begin with 3 pumps of K18 mask, only add more as needed depending on length, thickness, and condition. Apply all over, one pump at a time, maximum dosage is 9 pumps.
  4. Let sit for 4 minutes. Do not rinse out.
  5. Then comb + style as usual (fine to add heat protectant or styling product now).
  6. Use for the first 4-6 washes, then as needed.

how to optimize k18

  • 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 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


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.


backed by science, loved by stylists

Our community of stylists and colorists believe K18 is liberating hair—no matter the hair type or generation.

K18 Biomimetic Hairscience - Mini Leave-in Molecular Repair Hair Mask 0.5 OZ



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0.17 oz.


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