A product image featuring two bottles of hair care products with a pink and yellow box in the background. The products are labeled with the brand name K18.
A product image featuring two bottles of hair care products with a pink and yellow box in the background. The products are labeled with the brand name K18.
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
A product image featuring two bottles of hair care products with a pink and yellow box in the background. The products are labeled with the brand name K18.
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
prep + repair at home duo
4.8
Rated 4.8 out of 5 stars
1,560 Reviews

prep + repair at home duo

Award-winning routine tackles buildup + damage between appointments.
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Description

Unlock strong, healthy hair at home with this biotech-powered duo. Mini PEPTIDE PREP™ detox shampoo deeply cleanses + bestselling full-size mask repairs all hair types in 4 minutes*.

 

 
*k18hairpro.com/disclaimers

A little goes a long way with our highly concentrated formulas. Start with the minimum recommended amount + build as needed.

Prep with detox shampoo

  1. Massage detox shampoo into hair + scalp to remove excess buildup
  2. Thoroughly rinse
  3. Repeat as needed
  4. Skip conditioner

Apply the leave-in molecular repair hair mask

  1. Towel-dry thoroughly
  2. 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
  3. Let sit for 4 minutes. Do not rinse out

Just 2 steps to maximum damage repair:

Prep hair with the mini color-safe detox shampoo. Non-stripping + pH-optimized, it removes 99% product buildup, 95% sebum + 76% copper after just 1 wash*.

Reverse damage from lightener* + color*, chemical services* + heat* with the leave-in molecular repair hair mask. Powered by K18PEPTIDE™, it reconnects broken disulfide bonds + polypeptide chains for immediate + lasting repair at the molecular level (where all hair is the same).

*k18hairpro.com/disclaimers

  • DO use detox shampoo before the mask to remove buildup and help our peptide penetrate and get where it needs to go.
  • DO wait the full 4 minutes after mask application before styling or applying other product.
  • DO use for 4-6 shampoos consecutively to see and feel ongoing results.
  • DON’T condition your hair before application (trust us, most won’t need it after K18, if you still need, add a leave-in after the 4-minute window is up post-application).
  • DON’T overuse, a little goes a long way.
  • DON’T rinse out. This is a leave-in, so you know, leave it in!

One use of PEPTIDE PREP™ detox shampoo removes: 99% of product buildup*, 95% of sebum*, and 76% of copper*

One use of leave-in molecular repair hair mask: Repairs hair damage caused by lightener* + color*, chemical services*, and heat* in just 4 minutes

*k18hairpro.com/disclaimers

leave-in molecular repair hair mask
Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20,sh-Oligopeptide-78 (K18PEPTIDE™),Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.

PEPTIDE PREP™ detox shampoo
Water (Aqua) (Eau), Sodium C14-16 Olefin Sulfonate, Cocamidopropyl Hydroxysultaine, Salicylic Acid, Charcoal Powder, sh-Oligopeptide-78 (K18PEPTIDE™), Panthenol, Glycerin, Sodium Phytate, Guar Hydroxypropyltrimonium Chloride, Caprylyl Glycol, Caprylhydroxamic Acid, Citric Acid, Potassium Hydroxide, Sodium Hydroxide, Fragrance (Parfum), Benzyl Salicylate, Limonene.

Description

Unlock strong, healthy hair at home with this biotech-powered duo. Mini PEPTIDE PREP™ detox shampoo deeply cleanses + bestselling full-size mask repairs all hair types in 4 minutes*.

 

 
*k18hairpro.com/disclaimers

got questions?
Get started here
K18 detox shampoo removes product buildup, oil, and metals and minerals from hair. Clearing buildup ensures maximum penetration of the K18PEPTIDE™.
Conditioner can block the K18PEPTIDE™ from penetrating effectively.
Wait 4 minutes before applying additional products to allow the K18PEPTIDE™ to provide maximum reparative benefits and to reach the innermost layers of your hair.
Use for 4-6 consecutive washes then every other wash or as needed.
No, you don't need to do anything to activate the product. You can work between your hands to help with even distribution.
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.

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pros using K18
4.8
Rated 4.8 out of 5 stars
Based on 1,560 reviews
97%would recommend these products
Customers Talked About
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1,560 reviews
  • Melanie G.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 25 - 34
    Hair Concern Chemical damage, Heat damage, Fragile/brittle hair, Split-Ends
    Hair Type Fine/Thin
    My Results Shinier Hair, Smoother Hair, Soft Touchable Hair, Visible Difference, Stronger Hair
    Rated 5 out of 5 stars
    5 days ago
    Love this stuff!

    I'm trying to grow out my natural hair which I used to bleach, and this stuff has been a total miracle product! Transitioning away from bleach is usually a nightmare of breakage and split ends, but since adding K18 to my routine, I’ve noticed a massive difference. It actually makes my hair feel stronger, healthier, and way more resilient. It’s significantly cut down on the snap-and-breakage I used to get, allowing me to finally retain some length.

    Was this helpful?
    K18Hair PRO
    5 days ago

    Thank you for sharing your experience, Melanie! We're thrilled to hear K18 has helped strengthen your hair and reduce breakage during your transition from bleaching. Your hair health journey means so much to us!

  • Pearl D.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 25 - 34
    Hair Concern Chemical damage, Heat damage, Color-care, Frizz, Fragile/brittle hair
    Hair Type Curly/Coily
    My Results Visible Difference, Less Breakage, Stronger Hair, Defined Curl/Wave Pattern, Cleaner, fresher hair
    Rated 5 out of 5 stars
    6 days ago
    Can’t live without

    Helps my blonde hair so much

    Was this helpful?
    K18Hair PRO
    6 days ago

    Thank you Pearl! We're so happy to hear our Leave-In Molecular Repair Hair Mask has become essential for your blonde hair. Your support means everything to us!

  • Crystal G.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 45 - 54
    Hair Concern Chemical damage, Color-care, Frizz, Fragile/brittle hair, Extending time between washes
    Hair Type Fine/Thin
    My Results Less Frizz, Visible Difference, Stronger Hair, Less Breakage
    Rated 5 out of 5 stars
    1 week ago
    Amazing

    True believer in you get what you pay for! This leave in has helped my hair do much after an over processing disaster. Could notice the difference even after one use. I’ve basically gotten rid of regular wash out conditioner and use only this and another one from Redken that I alternate with!

    Was this helpful?
    K18Hair PRO
    1 week ago

    Thank you for your amazing review, Crystal! We're thrilled the mask helped repair your over-processed hair and that you noticed results after just one use!

  • Nucole N.
    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, Chemical damage
    Hair Type Curly/Coily
    My Results Stronger Hair, Defined Curl/Wave Pattern
    Rated 5 out of 5 stars
    2 weeks ago
    K18

    I have been using this for a week now and I have great results my curls are coming back so much better still have a long way to go but this product is amazing

    Was this helpful?
    K18Hair PRO
    2 weeks ago

    Thank you for the wonderful review! We're so happy to hear your curls are coming back and that you're seeing great results with the Molecular Repair Hair Mask already!

  • Dena F.
    Verified Buyer
    Reviewing
    Full-Size Leave-In Molecular Repair Hair Mask 50 mL (WHOLESALE)
    I recommend this product
    Age 18 - 24
    Hair Concern Split-Ends
    Hair Type Fine/Thin
    My Results Less Frizz, Visible Difference, Less Breakage, Smoother Hair
    Rated 5 out of 5 stars
    3 weeks ago
    Good stuff

    I have very baby fine hair. I have been struggling to find a shampoo and conditioner that will make my hair look, soft and shiny and not weighed down and drab. I've only been using this for two weeks so far so good definite improvement in the texture my hair softer and shinier. I can't use the hair oil because it's too heavy for my hair., I will keep working with it. The molecular hair oil works really well from my daughter's hair and my son. I love how this company gives out decent samples too. It's such a good way to share with other people and then try the product before you wired to see if it works well for you or not.

    Was this helpful?
    K18Hair PRO
    3 weeks ago

    Thank you for the wonderful review! We're so happy to hear the Molecular Repair Hair Mask is making your fine hair softer and shinier. Thanks for sharing your experience!

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