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Damage repair starter set
healthier hair + scalp after just one wash
clarify hair - just one wash removes 99% product buildup, 95% sebum + 76% copper*
K18 Mask Benefits
one use of molecular repair hair oil delivers: clinically proven damage repair, 24-hr frizz control, 104% more shine, 78% reduction in split ends, and 450F heat protection
78% reduction in split ends

damage repair starter set

limited-time set to reset, repair + smooth
Rated 5.0 out of 5
Based on 5 reviews

Jump-start your healthy hair routine in 3 steps with this biotech-powered set. PEPTIDE PREP™ detox shampoo removes buildup + metals for maximum molecular repair results. Our bestselling leave-in molecular repair hair mask reverses damage in 4 minutes*. The molecular repair hair oil fights frizz from within for immediate + long-term frizz control.                                                           

*Disclaimers

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This biotech-powered set delivers cleaner, healthier, frizz-free hair.

Start with our color-safe mini detox shampoo to clear product buildup, excess oil, and metals from hard water. Follow with the bestselling leave-in molecular repair hair mask—powered by the K18PEPTIDE™ and clinically proven to reverse damage from bleach + color, chemical services, and heat* in 4 minutes. Finish with the mini oil, a strengthening defrizz solution that softens, adds shine, reduces split ends, and provides 450°F (232°C) heat protection*.

*Disclaimers

Just one use of PEPTIDE PREP™ detox shampoo removes*:
99% of product buildup
95% of sebum
76% of copper

One use of leave-in molecular repair hair mask delivers*:
Healthier hair in 4 minutes

One use of molecular repair hair oil delivers*:
Clinically proven damage repair
24-HR frizz control
104% more shine
78% reduction in split ends
450°F (232°C) heat protection

*Disclaimers

Begin 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 3 pumps of K18 leave-in molecular repair hair mask and add more as needed. Maximum recommended usage is 9 pumps.
  3. Apply all over, 1 pump at a time.
  4. Let sit for 4 minutes. Do not rinse out.

Finish with the molecular repair hair oil

  1. Apply 1-3 drops of molecular repair hair oil to damp hair, starting at the ends and working upward through the mid-lengths.
  2. Wait 4 minutes. Style as usual.
  3. Apply an additional 1-3 drops of molecular repair hair oil to dry hair as a finisher.

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

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

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.

molecular repair hair oil
Caprylyl Caprylate/Caprate, Squalane, Persea Gratissima (Avocado) Oil, Helianthus Annuus (Sunflower) Oil, C13-15 Alkane, Undecane, Benzyl Alcohol, Tridecane, Castor Isostearate Succinate, Propanediol, sh-Oligopeptide-78, Fragrance (Parfum), Tocopherol, Cinnamal, Hexyl Cinnamal, Limonene, Linalool.

pairs well with

DAMAGE SHIELD protective conditioner

Rated 4.6 out of 5
Based on 148 reviews
Nourishing conditioner shields hair from daily damage

DAMAGE SHIELD pH protective shampoo

Rated 4.6 out of 5
Based on 286 reviews
Color-safe protective shampoo maintains hair health + strength

Description

Jump-start your healthy hair routine in 3 steps with this biotech-powered set. PEPTIDE PREP™ detox shampoo removes buildup + metals for maximum molecular repair results. Our bestselling leave-in molecular repair hair mask reverses damage in 4 minutes*. The molecular repair hair oil fights frizz from within for immediate + long-term frizz control.                                                           

*Disclaimers

got questions?

Get started here

Yes, it is better to use the full K18 routine for optimal service and molecular repair results.

To achieve the best cumulative results, we recommend using these routines:
when you need to repair damage: detox shampoo + mask
when you need to protect against daily damage: DAMAGE SHIELD shampoo + conditioner
every day: molecular repair hair oil
between wash days: AirWash™ dry shampoo

Before K18 molecular repair mask or oil, our PEPTIDE PREP™ detox shampoo tackles buildup + metals to create the cleanest, healthiest hair canvas. With our molecular repair formulas, you get maximum damage repair plus additional styling benefits with the oil. Use the DAMAGE SHIELD shampoo + conditioner to protect hair from daily damage between K18 mask days—and keep healthy hair going in-between salon appointments. Use AirWash™ dry shampoo to refresh hair between washes with an instant, weightless clean.

No, the detox shampoo will not dry your hair out. This non-stripping formula has a pH of 3.8-4.2 that won’t leave hair over-stripped. In a consumer study, 90%* said hair feels clean without feeling dry. *Disclaimers

The molecular repair hair mask and oil work together to give you the reparative benefits of the K18PEPTIDE™ in both formulas. The oil will add additional frizz-reducing, styling, and heat-protecting properties. You can layer the oil on top of the mask after the 4-minute processing time.

No, the mask will not block the molecular repair hair oil from penetrating. The mask is a highly concentrated treatment without any fillers so it won’t block the oil from penetrating. Like layering different skincare products, the oil can be layered on top of the mask without impacting its performance.

K18 molecular repair + PEPTIDE PREP™ shampoos are formulated with the K18PEPTIDE™. In our molecular repair products, the peptide works at the innermost layers to reverse hair damage. In our PEPTIDE PREP™ shampoos, the peptide helps reduce protein loss to help keep hair feeling healthy and strong.
Straight bleached hair after using K18 mask.
Straight bleached hair before using K18 mask.

see molecular repair in action

The K18 leave-in molecular repair hair mask delivers lasting + progressive results, for healthier hair with each use.

the K18 difference

Feel what’s possible with fewer steps, less waste + less time.
efficacy
patented K18PEPTIDE™ powers deeper + lasting repair.
simplicity
fewer steps for a streamlined routine.
speed
results in one 4-minute use.

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.

reviews

average rating 5.0 out of 5
Based on 5 reviews
  • 5 Stars
    5 Reviews
  • 4 Stars
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    0 Reviews
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    0 Reviews
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100% of reviewers would recommend this product to a friend
Customer photos and videos
5 Reviews
Reviewed by Angelina
I recommend this product
Rated 5 out of 5
Review posted

5 Stars

Good Product

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K18Hair

Thank you for your review Angelina!

Reviewed by Mary
I recommend this product
Rated 5 out of 5
Review posted

5 Stars

Love this product

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K18Hair

We appreciate your review!

Reviewed by Eileen
Verified Reviewer
I recommend this product
Age
65+
Hair Concern
  • Extending time between washes
Hair Type
  • Medium Density
  • Grey Hair
My Results
  • Visible Difference
  • Stronger Hair
  • Shinier Hair
  • Soft Touchable Hair
  • Smoother Hair
Rated 5 out of 5
Review posted

You’re NOT dreaming!

In my 66+ years I’ve never been able to just wash my hair in the shower & only utilize 1 product, and be left with the silkiest, shiniest, healthiest hair EVER! It’s totally changed my routine, but more importantly, I can continue to keep my long, single process hair in the best condition it’s ever known! I recommend it to all of my clients, as I’m living proof of the results!

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K18Hair

Thank you Eileen! We appreciate your review and referrals!

Reviewed by Meghan B.
Verified Buyer
I recommend this product
Age
35 - 44
Client Hair Concerns
  • Chemical Damage
  • Heat Damage
  • Color Care
  • Frizz
  • Split Ends
Client Hair Types
  • Medium Density
Client Results
  • Stronger hair
  • Less Breakage
  • Soft Touchable Hair
  • Shinier Hair
  • Visible Difference
Rated 5 out of 5
Review posted

Perfect for clients

Love this take home kit for my clients! This allows them to continue to repair their hair at home so when they return to the salon their hair is in optimal condition for processing. The detox shampoo leaves your hair and scalp feeling cleansed and nourished, the mask is creamy and luxurious. I like to use the oil prior to drying and also a couple drops after for softness.

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K18Hair

You are a rockstar Meghan! Looking out for healthy hair for your clients! Thank you for your review!

Reviewed by Kelly W.
Verified Buyer
I recommend this product
Age
45 - 54
Client Hair Concerns
  • Heat Damage
  • Split Ends
  • Dryness
  • Oily hair/scalp
  • Fragile/Brittle Hair
Client Hair Types
  • Thick/Coarse
  • Medium Density
  • Curly/Coily
  • Grey Hair
  • Straight/Wavy
Client Results
  • Cleaner, fresher hair
  • Visible Difference
  • Stronger hair
  • Shinier Hair
  • Smoother Hair
Rated 5 out of 5
Review posted

Healthier hair journeys start here

It’s ez to use & makes the hair feel silky soft

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K18Hair

Welcome to the healthy hair journey! Thank you Kelly for your review!

recommended products

full-size leave-in molecular repair hair mask
Rated 4.6 out of 5
Based on 7508 reviews
4-minute leave-in treatment to reverse hair damage
K18 molecular repair hair oil
Rated 4.7 out of 5
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PEPTIDE PREP™ detox shampoo
Rated 4.8 out of 5
Based on 288 reviews
Color-safe, non-stripping clarifying shampoo with the K18PEPTIDE™
DAMAGE SHIELD pH protective shampoo
Rated 4.6 out of 5
Based on 286 reviews
Color-safe protective shampoo maintains hair health + strength
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