Give damaged, stressed hair a targeted repair treatment with the K18 Leave-In Molecular Repair Hair Mask 50ml. This lightweight leave-in treatment is powered by K18PEPTIDE™, a biomimetic peptide technology designed to work at the molecular level to reconnect damaged polypeptide chains and disulfide bonds in the hair. K18 states that the formula is designed to address damage associated with bleach, color, chemical services and heat.

4-Minute Leave-In Hair Treatment

Unlike traditional rinse-out hair masks, the K18 Molecular Repair Hair Mask is designed to stay in the hair. After shampooing, towel-dry your hair thoroughly, apply 1–3 pumps depending on hair length and density, and allow the treatment to work for 4 minutes without rinsing. You can then comb, style or apply your usual styling products.

Powered by K18PEPTIDE™

The signature K18PEPTIDE™ technology is designed to mimic the structure of hair and reconnect broken polypeptide chains and disulfide bonds associated with damage. K18 describes the technology as working within the hair's keratin structure to support stronger, softer and smoother-feeling hair.

Designed for Damaged Hair

Hair can become stressed from repeated bleaching, coloring, chemical services and heat styling. K18 Molecular Repair Hair Mask is specifically formulated to target this type of damage, helping restore the look and feel of hair so it feels softer, smoother and more resilient.

The formula is also described by K18 as pH-optimized, vegan, color-safe and cruelty-free, and the brand states that it works across hair types.

Why Choose K18 Molecular Repair Hair Mask?

• Authentic K18 Leave-In Molecular Repair Hair Mask

• Convenient 50ml full-size format

• Leave-in treatment with a 4-minute processing time

• Powered by K18PEPTIDE™

• Designed for hair affected by bleach and color

• Suitable for damage associated with chemical services

• Designed to address heat-related hair damage

• Helps improve the look and feel of softness and smoothness

• Lightweight cream formula

• Works across hair types

• Color-safe

• Vegan

• Cruelty-free

• No rinse required after the 4-minute treatment period

Ideal For

K18 Molecular Repair Hair Mask is an excellent choice for customers searching for a professional hair repair treatment, damaged hair mask, leave-in hair treatment, bond repair alternative, color-treated hair treatment or premium haircare product.

It is particularly relevant for shoppers whose hair has been exposed to frequent coloring, bleaching, chemical treatments or heat styling and who want a convenient treatment that fits easily into their existing haircare routine.

How to Use

Step 1: Shampoo your hair and do not condition. Towel-dry thoroughly.

Step 2: Apply 1–3 pumps, depending on your hair length and density. Start at the ends and work toward the roots.

Step 3: Leave the product in your hair for 4 minutes. Do not rinse.

Step 4: Comb through your hair, add styling products if desired and style as usual.

K18 recommends using the treatment for 4–6 washes following a salon service and then as needed.

Product Details

• Brand: K18

• Product: Leave-In Molecular Repair Hair Mask

• Size: 50ml

• Product Type: Leave-In Hair Treatment

• Technology: K18PEPTIDE™

• Treatment Time: 4 Minutes

• Formula: Lightweight Cream

• Hair Concerns: Damage, dryness, weakened hair, heat/chemical/bleach/color-related damage

• Suitable For: All Hair Types

• Color Safe: Yes

• Vegan: Yes

• Cruelty-Free: Yes

• Category: Premium Haircare / Hair Repair Treatment

For customers looking for a premium K18 hair treatment, the K18 Leave-In Molecular Repair Hair Mask 50ml combines a simple 4-minute routine with K18's biomimetic peptide technology, making it a convenient addition to a professional-inspired haircare routine.