K18 Leave-In Molecular Repair Hair Mask

K18 Biomimetic Hairscience
5 mL, 0.17 fl oz
(2 reviews) Write a Review
A leave-in treatment mask for all hair types that clinically reverses damage in four minutes.
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A leave-in treatment mask for all hair types that clinically reverses damage in 4 minutes. The patented peptide technology works to repair damage from bleach, color, chemical services & heat– restoring strength, softness, smoothness, and bounce to hair.

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. Please see dosage chart for exact usage. For best results, use for the first 4-6 consecutive washes following a service, and then every 3-4 washes as needed to maintain hair strength.


  • Hair Repaired from the Inside Out
  • Healed Damage from Bleach, Color, Chemical Services, Heat, and Mechanical Styling
  • Restored Strength, Softness, Smooth, and Bounce
  • Reduced Breakage, Split-Ends, and Color Fade


The light floral scent features notes of jasmine and peony.


Shampoo, do not condition! Towel-dry thoroughly. 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. Let sit for 4 minutes. Do not rinse out. Comb + style as usual (fine to add heat protectant or styling product now).

Use for the first 4-6 washes, then as needed.


  • 5
    Best Hair Mask

    Posted by Christina on Feb 1st 2023

    I love using this whenever my hair feels dry. It helps hydrate and make my hair feel soft and look healthy. It's always a struggle to find a hair mask that doesn't weigh down my long fine hair. This product doesn't do that! I highly recommend it!

  • 5
    8 STARS

    Posted by Kerry on Jan 30th 2023

    Hair has never been so healthy!