
Highlights
- Leave-in hair treatment mask
- Rebuilds hair from the inside out
- Proven to reverse hair damage in 4 minutes
- Leave-in formula provides lasting results
MONDAY Haircare ULTIMATE MOISTURE Gift Set


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About this item
Product details
In just four minutes, the K18 Leave-in Molecular Repair Hair Mask reverses hair damage on a molecular level. K18 PEPTIDE has been proven to repair bleach and color damage, as well as chemical services and heat. It provides immediate and lasting results that restore hair strength, softness, smoothness, and bounce.
Renews Hair Strength and Elasticity
This hair mask is designed to provide smooth, bouncy hair by renewing its core strength and elasticity at the innermost layer. With its unique K18 PEPTIDE formula, this hair mask not only repairs bleach and color damage but also combats the effects of chemical services and heat exposure.
Hair Mask Starts Repairing Your Hair Immediately
The K18 Leave-in Molecular Repair Hair Mask starts repairing your hair immediately and lasts beyond your next wash, ensuring ongoing reparative results.
Suitable for All Hair Types
This hair mask is suitable for all hair types, as it works on a molecular level where all hair is the same. Whether you have straight, wavy, curly, or coily hair, the K18 Leave-in Molecular Repair Hair Mask helps to improve hair quality and texture.
Disclaimer: Sam’s Club is committed to offering quality products and services at an exceptional value. To serve this goal, these products were not purchased directly from the manufacturer or its authorized distributor but from a third-party dealer with strict controls to verify authenticity and quality. Some manufacturers limit or exclude their warranties on these products. However, these items remain fully covered by Sam’s Club’s 100% Merchandise Satisfaction Guarantee. If you are not satisfied with your purchase for any reason, return your item and we'll replace it or provide a refund.
Specifications
- Vegan
- Cruelty-free
- Color-safe
Member ratings & reviews
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Showing 1-3 of 9 reviews
Lives up to the hype.
I absolutely love K18. My hair has been damaged for so long and so frizzy. I decided to try K18. I didn't have much hope. I noticed a huge difference with the first use. My hair afterwards was so soft and frizz free. My 2nd use, even better! The improvement in my hair is amazing! I'll be repurchasing again. BTW, the K18 is 100% authentic!
bring back the larger size
love the product! it relaxes my curls with no frizz my only complain why did theytake away the larger size!!
Great product. I wish they would bring the bigger size back!
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