K18 Leave-In Molecular Repair Treatment
K18 Leave-In Molecular Repair Treatment
🧬 Molecular Repair
⏱️ 4-Minute Results
🎨 Color & Bleach Safe
💨 Lightweight Leave-In
🌱 Vegan & Cruelty-Free
Couldn't load pickup availability
K18 Leave-In Molecular Repair Treatment
How to use
How to use
Shampoo, do not condition. Towel-dry thoroughly.
Apply 1-3 pumps of K18 leave-in molecular repair hair mask based on your length and density, starting at the ends and working up towards the roots.
Let sit for 4 minutes. Do not rinse out.
Comb, add product + style as usual. Use for 4-6 washes post-salon service, then as needed.
More to know
More to know
It is a biotech-developed peptide that mimics hair's structure to reverse damage by reconnecting polypeptide chains and disulfide bonds broken during bleaching, color and chemical services + heat*.
pH-optimized (5.0-6.0) to help minimize cuticle swelling + put hair proteins in their most resilient state.
Cream format enables easy, lightweight application across all hair types, with detangling and softening benefits.
Vegan, color-safe, cruelty-free.
Key benefits
Key benefits
Takes damage repair further – reconnects both polypeptide chains (and as a result, also reconnects disulfide bonds) for strength along the length + width of the hair - offering comprehensive, lasting damage repair.
Restores hair from even extreme damage - by working at the innermost layer of the hair, core strength and elasticity are renewed for strong, smooth, bouncy hair.
Delivers immediate and lasting results – hair is repaired from the first use and lasts past your next wash, for ongoing reparative benefits.
Simplified repair - convenient, leave-in formula works in just 4 minutes, with no extra rinse required.
Works on all hair types – because it works on a molecular level (where all hair is the same), this product is effective on all hair types.
Dos and don'ts
Dos and don'ts
- 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 for 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.
Ingredients
Ingredients
Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20,sh-Oligopeptide-78 , Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.
K18 Leave-In Molecular Hair Mask
Repairs dry or damaged hair, reversing damage from bleach, color, chemical services & heat.
Clinically proven to repair hair at a molecular level for stronger, healthier strands.
Curly, straight, thick, or fine—this treatment adapts to every hair texture.
Instantly improves smoothness, shine, and manageability for salon-quality results.
Leave-in formula works in just 4 minutes—no rinse required, no heavy build-up.
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
Multiple Free Gifts 🎁
30% Discount
60 Days Refund Policy
See How K18 Haircare Compares To Other Falsies
“Unlike traditional haircare that only masks damage, K18 works at the molecular level with biomimetic peptide technology to actually repair hair from the inside out"
| K18 Haircare | Others | |
|---|---|---|
| Repairs Hair at Molecular Level | ||
| Long-lasting Results | ||
| Stops Breakage & Split Ends | ||
| Color Safe | ||
| Lightweight, No Build-Up | ||
| Time Efficient | ||
| Cumulative Effect |
See The K18 Difference
Before
After
TikTok-Viral Results — See It In Action
Real transformations in just 4 minutes with K18 Haircare™.
From Damaged to Transformed
92%
saw softer, smoother hair after just one use
91%
noticed lasting hydration and shine
95%
said their hair felt stronger and healthier
89%
saw visible repair from bleach & color damage
98%
reported reduced breakage and split ends
88%
felt more confident in their hair’s appearance
Trusted by thousands who repaired their hair with K18.
How to use molecular repair mask
1. Shampoo, do not condition. Towel-dry thoroughly.
2. Apply 1-3 pumps based on your length and density, starting at the ends and working up towards the roots.
3. Let sit for 4 minutes. Do not rinse out.
4. Comb, add styling product + style as usual. Use for 4-6 washes, then as needed.
What Our Customers Say
"Absolutely amazing! My hair feels so much healthier and softer after just a few uses."
"I noticed a huge difference in smoothness and shine. Feels like a salon treatment at home!"
"Best hair mask I’ve tried! Repairs damage without weighing down my hair."
Frequently Asked Questions
Everything you need to know about the K18 Haircare™ Leave-In Molecular Repair Mask.