Rated 4.8 out of 5
1760 ReviewsBased on 1760 reviews
Retail size of our 4-minute leave-in treatment to reverse hair damage
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pairs well with
molecular repair hair oil
Rated 4.8 out of 5
331 ReviewsBased on 331 reviews
Weightless oil that strengthens, repairs damage + reduces frizzLog In / REGISTER
PEPTIDE PREP™ detox shampoo
Rated 4.8 out of 5
214 ReviewsBased on 214 reviews
Retail size of our color-safe, non-stripping clarifying shampoo formulated with the K18PEPTIDE™Log In / REGISTER
Description
A retail-sized version of the K18 mask helps to maintain your client's hair strength and elasticity in-between salon appointments. This leave-in treatment mask for all hair types that reverses damage in 4 minutes. Patented peptide technology works to repair damage from bleach + color, chemical services, and heat* — restoring strength, softness, smoothness, and bounce to hair.
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K18 is engineered to work with every hair type, in every service, and with every routine.
Traditional conditioners leave a film on hair 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 styling product.
Water in damp hair swells the cuticle (the outside layer of hair) to open the gates for our biomimetic peptide to enter and travel to the innermost layers of hair. If the gates aren’t open, the product will stay on the surface—giving you mostly superficial repair. By applying on damp hair, you can use less, waste less, and still get the best results.
Think of the K18 mask as a highly concentrated treatment. It restores hair’s strength + elasticity in the innermost layers of hair, instead of traditional conditioners that coat the outside of hair. After the 4-minute wait time post-K18 mask, feel free to add a leave-in for a boost of conditioning if needed.
Yes, both formulas are the same. The PRO mask is conveniently sized for PRO use.
healthier hair with every use
Reverse damage in 4 minutes with our breakthrough K18 molecular repair technology.
how to use K18
lightener / color
1. Section dry hair into 4 quadrants.
2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.
3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.
4. Wait 4 minutes (do not rinse out).
5. If needed, dry the hair prior to applying lightener or color. Then perform your desired technique.
6. Process your lightener or color as usual, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.
7. Apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.
8. Wait 4 minutes (do not rinse), then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.
9. Wait 4 minutes, then proceed with cut or style as usual.
10. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.
*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.
Please see the “K18 + toning or glossing” section for more information on toning with K18.
toning / glossing
1. Process lightener or color as usual, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.
2. Apply a minimum of 10 full sprays of K18 professional molecular repair hair mist per quadrant, increasing up to 20 sprays as needed, depending on client’s length, density, or level of damage.
3. Wait 4 minutes (do not rinse), then apply toner or gloss.
4. Process toner or gloss as usual, then rinse. If shampooing, follow with DAMAGE SHIELD pH protective shampoo. Do not condition.
5. Towel dry hair, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.
6. Wait 4 minutes, then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.
7. Wait 4 minutes, then proceed with cut or style as usual.
8. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.
perm
1. Section dry hair into 4 quadrants.
2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.
3. Wait 4 minutes after chelating**, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.
4. Towel dry hair, then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.
5. Wait 4 minutes (do not rinse), then wrap, process, and neutralize perm as usual.
6. Once perm is complete, remove rods and gently towel dry.
7. Apply a minimum of 10 full sprays of K18 professional molecular repair hair mist per quadrant, increasing up to 20 sprays as needed, depending on client’s length, density, or level of damage.
8. Wait 4 minutes (do not rinse), then proceed with cut or style as usual.
*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.
To avoid weighing down fresh curls, it is not recommended to use the K18 professional molecular repair hair mask or oil immediately after completing a perm service.
relaxer
1. Section dry hair into 4 quadrants.
2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.
3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.
4. Wait 4 minutes (do not rinse out) and if needed, dry the hair prior to beginning relaxer application.
5. Apply + process relaxer as usual, then rinse thoroughly.
6. Towel dry hair, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.
7. Wait 4 minutes (do not rinse), then follow with neutralizing shampoo. Do not condition.
8. Towel dry thoroughly, then re-apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.
9. Wait 4 minutes (do not rinse), then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.
10. Wait 4 minutes, then proceed with cut or style as usual.
11. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.
*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.
thermal reconditioner
1. Section dry hair into 4 quadrants.
2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.
3. Wait 4 minutes after chelating**, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo. Do not condition.
4. Towel dry hair, then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.
5. Wait 4 minutes, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, starting at the ends and working up towards the roots.
6. Wait 4 minutes, then apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends.
7. Wait 4 minutes, then style as usual.
8. Add an additional 1-3 drops of K18 molecular repair hair oil to dry hair as a finisher.
*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.
keratin straightener
1. Section dry hair into 4 quadrants.
2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.
3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.
4. Wait 4 minutes (do not rinse out). Then follow with the recommended shampoo per your keratin straightener service instructions.
5. Apply and process keratin straightener as usual.
6. Apply 1-3 drops of K18 molecular repair hair oil to mid-lengths and ends on dry hair as a finisher.
*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.
**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.
Wait 3-4 shampoos post-treatment before using the K18 molecular repair hair mask in the salon or at home.
extensions
On natural hair (prior to installation):
1. Section dry hair into 4 quadrants.
2. Apply 6-10 sprays of K18 pro chelating hair complex per quadrant*.
3. Wait 4 minutes after chelating** (do not rinse out), then apply a minimum of 10 full sprays of K18 professional molecular repair hair mist to each quadrant, increasing up to 20 sprays per quadrant as needed, depending on client’s length, density, or level of damage.
4. Wait 4 minutes, then rinse and shampoo with K18 PEPTIDE PREP™ detox shampoo (do not condition)
5. Towel dry hair, then apply 1-3 pumps of K18 professional molecular repair hair mask based on your client’s length and density, only to the ends and mid-lengths (avoiding the root).
6. Wait 4 minutes (do not rinse), then proceed with extension installation as usual.
Using K18 on extensions alone or on clients with previously installed extensions:
K18 is suitable for use on all human hair extensions (to include tape-in, k-tip, hand tied, clip-in, sew-in, etc.). For information on using K18 on clients with previously installed extensions, please follow the instructions for the specific service being performed.
PRO tip: When working on clients with tape-in extensions, we recommend following the standard protocol for cream-based conditioner or oil usage. For best results, do not apply the K18 professional molecular repair hair mask or molecular repair hair oil directly to the weft adhesive or to the natural hair immediately surrounding the adhesive as it could cause slippage.
*For cases of extreme metal + mineral buildup, process up to 10 minutes, then proceed with the instructions.**For best results, we recommend to use K18 chelator before every service. If not using K18 chelator, lightly dampen hair with water (do not saturate) before applying K18 PRO mist.
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how molecular repair compares
how K18 works
Traveling into the innermost layers of hair, our K18PEPTIDE™ renews strength along the width AND length of hair for lasting strength where it matters.
feel what's possible with K18
See how K18 unlocks our community's expression
reviews
average rating4.8out of 5
Based on 1760 reviews
5 Stars
1606 Reviews
4 Stars
91 Reviews
3 Stars
35 Reviews
2 Stars
8 Reviews
1 Star
20 Reviews
97%of reviewers would recommend this product to a friend
1760 Reviews
Age
Client Hair Concerns
Client Hair Types
Client Results
AB
Ariana B.Reviewed by Ariana B.
Verified Buyer
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
I recommend this product
Age
18 - 24
Hair Concern
- Chemical damage
- Frizz
- Fragile/brittle hair
- Dryness
- Split-Ends
Hair Type
- Straight/Wavy
My Results
- Less Frizz
- Visible Difference
- Shinier Hair
- Smoother Hair
- Less Breakage
Rated 5 out of 5
Review posted
Works As It Says
Hair was pretty brittle & dry lately , a little bit dead too since I started using the leave in mask my hair looks better especially after drying & brushing it out way better looking then usual, this is my second time ordering this time it was the full size would definitely order again
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jOANNE V.Reviewed by jOANNE V.
Verified Buyer
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
I recommend this product
Age
65+
Hair Concern
- Frizz
Hair Type
- Thick/Coarse
My Results
- Visible Difference
- Stronger Hair
- Soft Touchable Hair
- Cleaner, fresher hair
- Smoother Hair
Rated 5 out of 5
Review posted
Miracle Hair Remedy
K18 Repair Hair Mask delivers what it promises! I developed the most incredibly frizzy hair during Covid (and my hair is normally straight). I couldn't even get a comb through it, and the products my hairdresser used did NOT work. This situation lasted almost two years! Finally, she found K18, and, overnight, my hair has changed. It is now soft, shiny, and STRAIGHT. I am very happy with this product!
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AP
Alyssa P.Reviewed by Alyssa P.
Verified Buyer
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
I recommend this product
Age
25 - 34
Hair Concern
- Heat damage
- Fragile/brittle hair
- Dryness
- Chemical damage
Hair Type
- Fine/Thin
My Results
- Stronger Hair
- Less Breakage
Rated 5 out of 5
Review posted
K18 review
K18 mark is the best hair product out there!
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K18Hair PRO
We appreciate your 5-star review! Thank you Alyssa!
SB
Stephanie B.Reviewed by Stephanie B.
Verified Buyer
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
I recommend this product
Age
55 - 64
Hair Concern
- Color-care
- Chemical damage
- Heat damage
- Frizz
- Dryness
Hair Type
- Thick/Coarse
- Grey Hair
- Curly/Coily
My Results
- Less Frizz
- Visible Difference
- Soft Touchable Hair
Rated 5 out of 5
Review posted
Improved hair texture
If you are aging and cannot find anything to provide the moisture your hair once had, switch to K18 hair mask. I had tried every high end treatment with no luck. The first time I used this, I was getting my hair washed by my stylist and she asked me what I had done differently to my hair. One week later I noticed she had some other K18 products she began using in the salon. This stuff is next level.
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K18Hair PRO
We love when the Pro's notice! Thank you for your review!
WE
Wanda E.Reviewed by Wanda E.
Reviewing
Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
I recommend this product
Age
65+
Rated 5 out of 5
Review posted
Best things that hit the hair industry!!
I am a professional stylist of hair/Salon owner, and have been in the industry fire close to 49 years. I am a salon owner in Columbia South Carolina, I went into Salon Cenrtric for one line of product that works similar to K18, and was redirected to, K18 by the store clerk.
He explained to me that K18 was “the new kid on the block”, and a game changer. I got excited, and purchase the small sample kit for right under $60.
Used the product as instructed on tithe majority of my clients that entire week, because I felt that if they had not had a K18 treatment they needed to get their hair had not been properly conditioned up until this point. Although I use professional products and emphasize on healthy hair, after I saw the results of what K18 does to the hair, I was sold, and went back to Salon Centric and purchased all back bar sizes of the line, and didn’t mind investing the approximately $550 in this product. I knew it would be worth it, and I knew it wouldn’t take long to get the return on my investment. As little as 1 month maybe sooner! This especially after we consult with our clients and explain what the K18 if for and what it will do to their hair. At this point I don’t see the purpose for using any of the shampoos and conditioners that I already have and been using on my clients. K18 is the answer to all of my clients hair care needs.
A GAME CHANGER.
I no longer have to guess and invest in other products not knowing and seeing it’s just a waste of time and money,…
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K18Hair PRO
Thank you Wanda! You are the real game changer! Don't forget to sign up to our Pro site K18HairPro.com.