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K18

K18 Leave-In Molecular Repair Hair Mask, Patented, Lasting Repair For Dry, Frizzy, Damaged Hair, Reverse Damage In 4 Minutes From Bleach, Color, Chemical Services + Heat

  • Based on 30,450 reviews
Condition: New
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As low as $12.50 / mo
  • – 6-month term
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Size: 1.7 Fl Oz (Pack of 1)


Features

  • K18 x Future Society Hair Repair Treatment: A leave-in peptide hair mask that repairs and reverses damage at the molecular levelnow infused with a limited-edition biotech fragrance inspired by extinct flower DNA for a multisensory experience that leaves hair stronger, smoother, and more resilient in just 4 minutes.
  • How It Works: Patented K18PEPTIDE repairs hair at a molecular level to reverse damage from bleach, color, chemical services, and heat*. The biotech-developed peptide mimics and clicks into hair's keratin structure to reconnect polypeptide chains and disulfide bonds for strength along the length + width of hair.
  • Works on All Hair Types: Because our hair treatment works at the innermost layer of the hair rather than only targeting the outer cuticle like many deep conditioning hair masks, it's effective on all strands, even coily and curly hair.
  • Boosts Strength + Smoothness: Helps improve texture, manageability, and bounce with a highly concentrated hair cream formula with detangling and softening benefits. Most see results after 2-3 uses.
  • How to Use: Shampoo, skip conditioner, and apply 1-3 pumps of the leave in hair mask to clean, towel-dried hair. Let sit for 4 minutes, do not rinse, then style as usual. Use for 4-6 consecutive washes, then as needed.

Description

How does the K18 mask work? The K18 Mask works as a treatment to reverse damage in 4 minutes. It’s powered by our biomimetic K18PEPTIDE to seamlessly fit in and reconnect broken polypeptide chains at the molecular level. What is the K18PEPTIDE? K18PEPTIDE is a biotech-developed peptide that mimics hair’s structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during damage from bleach + color, chemical services, and heat. Why skip conditioner? Conditioner leaves a film that blocks our peptide from penetrating effectively. Once the 4-minute wait time is up, feel free to use a conditioner, a leave-in, or any type of product. I noticed there’s alcohol in the formula, isn’t that bad for you? We like to keep our formulas minimal, only using the exact amount of ingredients needed to get the peptide where it needs to go. Here the alcohol serves as an agent to optimize the hair environment for the K18 Mask to work on a deeper level. When should I expect to see results? Most see results after 2-3 uses. The more damaged the hair, the more dramatic the results so it may vary depending on your hair type and level of damage. Molecular Repair Mask Molecular Repair Oil Damage Shield Shampoo Detox Shampoo Damage Shield Conditioner AirWash Dry Shampoo AstroLift Volume Spray Visit the Store Visit the Store Visit the Store Visit the Store

Package Dimensions ‏ : ‎ 4.31 x 1.94 x 1.94 inches; 3.21 ounces


UPC ‏ :


Manufacturer ‏ : ‎ K18


Best Sellers Rank: #102 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #1 in Hair Treatment Masks


#1 in Hair Treatment Masks:


Customer Reviews: 4.3 4.3 out of 5 stars (30,450)


Item Form: Cream


Hair Type: Chemically Treated, Curly, Fine, Straight, textured-hair


Product Benefits: Conditioning


Scent Name: Floating Forest


Unit Count: 1.7 Fluid Ounces


Number of Items: 1


Size: 1.7 Fl Oz (Pack of 1)


Brand Name: K18


Age Range Description: Adult


Manufacturer: K18


UPC: 990022400080


Material Features: Cruelty Free


Recommended Uses For Product: Hair Mask


Frequently asked questions

This product is currently out of stock. Please check back later for shipping info.

This item is non-returnable:

Non-returnable. Transportation of this item is subject to hazardous materials regulation

View our full returns policy here.

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Top Amazon Reviews


  • It works!
Helped my fried hair look and feel a lot better!😃
Reviewed in the United States on May 20, 2026 by susan warren

  • Wavy/Curly/frizzy hair?
It made my hair more frizzy and the quantity is very less and this particular product was supposed to have fragrance, it doesn’t somehow a bad batch maybe. Definitely not worth it for my wavy hair, w split-ends.
Reviewed in the United States on June 10, 2026 by Gireeshma Chowdary.kodali

  • Excellent!
This is an excellent product!! It really fixes dry and frizzed hair!! Hair shiny!!
Reviewed in the United States on May 18, 2026 by carmen zimeri

  • works well
it does work well, but is very expensive. I do not like how my hair feels and looks after use it makes my hair dull not shiny and it feels kind of dirty
Reviewed in the United States on May 12, 2026 by joan cummins

  • Doesn’t work
This product doesn’t make the same effect as described. Even using a tiny amount of it my hair gets heavy and so difficult to brush. No silky look at all as on image. Considering the price, I wasted a good amount of money for nothing.
Reviewed in the United States on May 18, 2026 by Aleksandra

  • Buyer Beware
Horrible product. Did nothing. I have curly, course hair and it actually made it worse. Adding insult to injury, the seller does not accept returns if the box has been opened and/or the product has been used! How on earth is someone supposed to know if they like this product if they’ve never used it! Considering that the cost, $75 this is a joke! ... show more
Reviewed in the United States on May 13, 2026 by Elizabeth Kelley

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