Leave-in molecular repair hair mask

This leave-in hair mask repairs damaged hair at the molecular level, reversing hair damage in just 4 minutes. Clinically proven, its ingredient K18PEPTlDETM repairs bleaching, chemical treatment, and heat damage, delivering immediate and long-lasting results, restoring hair to strength, softness, smoothness, and elasticity.

Fast-workingformulas

Simple + highlyconcentrated

Clinically validated + Biotechnology driven

SHOP NOW

Fragrance Notes on Limited Edition Fragrances

  • Top notes

    Cooling Bergamot + Black Pepper

  • Mid notes

    Dewy Freesia, Water Lily + Rose Absolute

  • Base notes

    Salted Musk, Wet Stones + Papyrus

    Core Technology and Ingredients

    • Core Active Ingredient: K18PEPTIDE™

      K18PEPTIDE™ is a biotechnology-developed peptide that mimics the structure of hair, repairing damaged hair by reconnecting peptide chains and disulfide bonds broken by bleaching, dyeing, and chemical heat treatment. It reconnects peptide chains (thus repairing disulfide bonds), providing comprehensive and lasting damage repair.

    • Auxiliary Ingredients: Protein-based ingredients

      Hydrolyzed wheat protein and hydrolyzed wheat starch have been added (see the China Daily science article: "Small molecule proteins penetrate the hair core without heating"). These small molecule proteins can fill the gaps in the hair core, restoring the hair's strength and elasticity.

    • pH Optimization: Formula pH Value

      The formula's pH value is controlled between 5.0 and 6.0, close to the hair's natural pH. This helps reduce cuticle swelling, maintains the "highly elastic state" of hair proteins, makes hair smooth, reduces frizz and split ends, improves hair quality, and thus reduces the risk of hair breakage during subsequent combing.

      How to use leave-in repair hair mask

      full-size leave-in molecular repair hair mask how to use

      1. Shampoo, do not condition. Towel-dry thoroughly.

      2. Apply 1-3 pumps of K18 leave-in molecularrepair hair maskbased onyour length and density, starting at the ends and working up towardsthe roots.

      3. Let sit for 4 minutes. Do not rinse out.


      4. Comb, add product + style as usual. Use for 4-6 washes post-salonservice,then as needed.

      Limited-Edition scent-50 mL how to use

      In the shower:
      Shampoo, don't condition.

      Out of the shower:
      Gently towel dry hair until damp.

      Apply one mL/one dime-sized amount of K18 Mask.

      Only add more as needed, Average use is two mL/two dime-sizeamounts (this is a highly concentrated formula, so you'll need muchless than traditional masks).
      Work evenly into hair from ends to roots.

      Wait four minutes for the K18PEPTlDErm to reach the innermost layersof hair
      Don't rinse out.

      Style as usual after the four minutes is up (fine to add heat protectantor styling product now).

      Use for the first four to six washes, then swap to maintenance modeand use as needed.

      Soft, strong, bouncy hair for everyone

      • "Finally decided to take good care of my hair! It was so dry, frizzy, and had so many split ends, I really should have cut it sooner! This time I got a new length, and also got highlights and a touch-up. My stylist used this hair mask on me immediately after the perm and color, and I absolutely loved how it felt on my hair...I love this hair mask so much!"
        -Christina Marie P.

      • "Finally decided to take good care of my hair! It was so dry, frizzy, and had so many split ends, I really should have cut it sooner! This time I got a new length, and also got highlights and a touch-up. My stylist used this hair mask on me immediately after the perm and color, and I absolutely loved how it felt on my hair...I love this hair mask so much!"
        -Ashley P.

      • "Its texture and the shine it gives to the hair are simply perfect! When applied to the hair, it's neither sticky nor heavy. It absorbs quickly without leaving any stickiness. You can feel the incredible smoothness when you gently comb your hair with your fingers. Even the ends of your hair, which are usually prone to tangling, become soft and bouncy."

        -Sandra M.

      • "It made my hair incredibly soft and light, I love it! I've tried so many hair care products before, and they were either not moisturizing enough, leaving my hair dry and frizzy, or too heavy and oily, making my hair flat and lifeless against my scalp. But this one is completely different. Not only does it not make my hair flat, but it also keeps every strand of hair bouncy and light, maintaining a perfect style all day long. I highly recommend this product!"

        - Olga S.

      • "My hair used to be very dry, frizzy, split, and rough because I often dyed and permed it. It would break easily when I combed it, and even a simple ponytail felt dry, fragile, and lacked elasticity. At first, I tried this hair mask with a try-it-and-see attitude, but I didn't expect the effect to be so good. I have used it four times now, and every time I wash my hair, I can feel that it is gradually improving and becoming healthier."

        -Anastasiia T.

      • "My hair became frizzy due to heat damage, dyeing, and perming. Tangling, pulling, and split ends were common occurrences when combing, making hair care time-consuming and frustrating. Until I encountered this product, it completely changed my hair care predicament. The previously unruly curls became smooth and manageable, and split ends were visibly reduced. Now it has become an indispensable part of my daily life."

        - Siria A.

        Meet our proprietary biotechnology:

        K18PEPTIDE™

        K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds including polypeptide chains and disulfide bonds to reverse damage from bleach, color, chemical services, and heat*. Developed through biotechnology, the K18PEPTIDE™ is optimized for human biology and uniquely matches and clicks into hair’s keratin structure, reconnecting damage sites at the molecular level, K18PEPTIDE™ delivers durable repair for all hair types, restoring strength and elasticity.

        This peptide was designed in accordance with our less-is-more formulation philosophy to simplify and minimize steps in hair routines. This biomimetic molecule laid the foundation for our biology-first approach to haircare and works in just four minutes, with no extra steps, and with results shown from the very first application. For salon use, find it in the K18REPAIR™ service (K18 professional molecular repair hair mask and PRO molecular repair hair mist), and for home use, find it in the molecular repair hair mask and molecular repair hair oil.

        ODORBIND™

        ODORBIND™ revolutionizes what’s possible when targeting and eliminating odors. Using biotechnology and synthetic biology, K18 bioscientists utilized DNA databases to find and mimic the strongest olfactory systems (our sense of smell) found in nature. ODORBIND™ harnesses that understanding of nature and biology to uniquely recognize, trap, and eliminate malodors, rendering them undetectable and releasing a subtle fragrance in their place. This smart-release molecule is vegan, cruelty-free, and certified Kosher and Halal. Find it in AirWash™, the reinvention of dry shampoo.

        Resilicore™

        Patented resilicore™ heat-shielding technology protects from heat deeper than ever before. Unlike traditional heat protectants that only coat hair’s cuticle, the size + molecular makeup of resilicore™ allows it to penetrate into hair's core to defend against heat from the cuticle to the cortex—as deep as heat damage goes. Inspired by proteins in nature that can withstand extreme temperatures, this protective shield fortifies hair from within for maximum protection against color fade, dry feeling, dullness, and breakage. This heat-shielding tech is inspired by nature, and recreated in the lab to be vegan, sustainable + and cruelty-free. Find it in HeatBounce, the future of heat protection.

        Come and take a look