Free Standard Shipping on $50+ Orders
free returns. buy with confidence
molecular repair hair oil
before + after k18 routine and oil
model with molecular repair hair oil
78% reduction in split ends
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
highly concentrated formula. start with 1-3 drops, build as needed.
silicone-free weightless oil is powered: K18PEPTIDE(TM), Avocado Oil, Sunflower Oil, Hemisqualane + Squalane.
how damage + frizz related? before + after of outer and inner layer
are you using K18 mask today?
K18 vs other oils
model image
model image
molecular repair hair oil formula
Molecular Repair Hair Oil
K18 routine guide
best seller
4.7
Rated 4.7 out of 5 stars
618 Reviews

K18 molecular repair hair oil

Weightless oil that strengthens, repairs damage + reduces frizz
OR

Description

This biotech-engineered weightless oil works on all hair types to strengthen, repair damage, reduce frizz at two levels of the hair fiber, and improve shine.

  • clinically proven damage repair
  • 24-HR frizz control
  • 104% more shine
  • 78% reduction in split ends
  • 450°F (232°C) heat protection

Strengthening, smoothing hair oil works on two levels of the hair fiber to fight frizz.

The K18PEPTIDE™ works to address deeper-level damage that causes frizz—repairing and strengthening damage at the innermost layer of hair to reverse damage that leads to frizz.

On the surface of hair, natural oils like avocado and sunflower oil, and hemisqualane and squalane nourish while smoothing frizz + flyaways to improve color vibrancy, enhance shine, and provide 450°F (232°C) heat protection.

  • Clinically proven to repair damaged hair*
  • 24-HR frizz control*
  • 104% increase in shine*
  • 78% reduction in split ends*
  • 450°F (232°C) heat protection*

*Disclaimers

This silicone-free oil fights frizz differently by addressing the damage that causes frizz long-term and immediately smoothing frizz + flyaways.

  • Reverses frizz-causing damage: Works at the molecular level to repair damaged hair, which is more susceptible to frizz
  • Reduces frizz + flyaways: Natural oils work on the surface of the hair to smooth the cuticle + soften without weighing hair down
  • Enhances shine + color vibrancy: Nourished, moisturized hair reflects higher shine and boosts color dimension
  • Delivers heat protection: to prevent further frizz-causing damage up to 450°F (232°C)

Apply to damp, towel-dried hair before styling, or on dry hair as a finisher. Highly concentrated formula. Start with 1-3 drops and build as needed.

Use on damp hair for: strengthening benefits and to reduce frizz during air-dry or styling

Use on dry hair to: smooth frizz and flyaways, as a finisher to add shine

  • Apply to damp hair from mid-lengths to ends. For strengthening benefits from the K18PEPTIDE™ wait 4 minutes before styling.
  • Apply to dry hair as a finisher.

Pro Tip - If using the K18 molecular repair mask, apply the mask first on clean, damp hair, then wait 4 minutes. Apply the molecular repair hair oil, and wait 4 minutes for maximum strengthening results.

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
full-size leave-in molecular repair hair mask
4.7
Rated 4.7 out of 5 stars
7,825 Reviews
4-minute leave-in treatment to reverse hair damage

Description

This biotech-engineered weightless oil works on all hair types to strengthen, repair damage, reduce frizz at two levels of the hair fiber, and improve shine.

got questions?

Get started here.
We recommend using the oil with the mask for maximum molecular repair with additional styling benefits. Think of the mask as a damage repair treatment after washing your hair. The oil is for smoothing, styling and strengthening after the mask, and can be used on damp and dry hair.
Yes, this oil provides heat protection up to 450°F/232°C.
No, it will not leave buildup or weigh down your hair. This weightless oil is powered by intentional ingredients to reduce frizz-causing damage on the molecular level inside the hair fiber, while natural oils work on the surface of hair without weighing it down.

Plus, you don’t need much of this highly concentrated formula to see results, just use 1-3 drops and build as needed. If you’re concerned about buildup, use our detox shampoo to remove 99% of product buildup after just 1 wash*.
*Disclaimers
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.
Instead of mixing the oil and mask together, get the most effective repair and styling benefits by using the mask first, waiting 4 minutes, and then applying the oil.

how to use it

PRO stylist + educator Carly Zanoni shows you how to apply the molecular repair hair oil.
PRO stylist + educator Eric Vaughn shows you how the K18 leave-in molecular repair hair mask + oil work together in your routine.
molecular repair

hair oil vs. mask

Do you use one over the other? Both? Glad you asked! Both are meant to be used at different parts of the routine but were created to work together for maximum impact
molecular repair oil
what it is: weightless, silicone-free hair oil

what it does: reverses damage that causes frizz long-term while immediately smoothing flyaways, adding shine, and reducing split ends

when to use: on damp or dry hair throughout styling
molecular repair mask
what it is: leave-in treatment

what it does: reverses hair damage in 4 minutes for lasting + progressive results

when to use: after shampoo, on damp, towel-dried hair before styling

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.

4.7
Rated 4.7 out of 5 stars
Based on 618 reviews
618 reviews
  • Georgina P.
    Verified Buyer
    hair oil sample
    Reviewing
    hair oil sample
    I recommend this product
    Rated 5 out of 5 stars
    19 hours ago
    Love it

    I’ve said it before, but I’ll say it again, this conditioner really works. I love it.

    K Profile picture for K18Hair
    K18Hair
    17 hours ago

    Thank you for your review!

  • Diana M.
    Verified Buyer
    mini molecular repair hair oil
    Reviewing
    mini molecular repair hair oil
    I recommend this product
    Age 25 - 34
    Client Hair Concerns Heat Damage, Color Care, Chemical Damage, Split Ends, Dryness
    Client Hair Types Fine/Thin
    Client Results Stronger hair, Visible Difference, Less Breakage, Soft Touchable Hair, Smoother Hair
    Rated 5 out of 5 stars
    23 hours ago
    El mejor aceite para el cabello

    Este aceite hidrata sin dejar el cabello pesado ni grasoso, es como si fuera un serum en lugar de un aceite, protege de el calor y ayuda a mejorar las puntas abiertas, soy estilista certificada como máster por la compañía bellami y me este es el mejor aceite que he probado, lo uso para mi y para mis clientas, para su cabello y para preparar sus extensiones. Lo recomiendo muchisimo.

    K Profile picture for K18Hair
    K18Hair
    17 hours ago

    ¡Gracias Diana! ¡Realmente apreciamos tu evaluación!

  • Sandy S.
    Verified Buyer
    Molecular Repair Hair Oil
    Reviewing
    Molecular Repair Hair Oil
    I recommend this product
    Age 45 - 54
    Hair Concern Color-care, Heat damage, Dryness, Frizz
    Hair Type Medium Density
    My Results Less Frizz, Smoother Hair
    Rated 4 out of 5 stars
    2 weeks ago
    Have not used it long enough to know- real results

    It definitely helps smooth out fly away hairs. You only need a tiny drop, so a bottle will last many months: so far do's good. I am unsure of long term results because I'm only a few weeks in. I'll check back!

    K Profile picture for K18Hair
    K18Hair
    2 weeks ago

    If you may have any questions please reach out via email at Hello@K18Hair.com. Thank you for your review!

  • Lisa P.
    Verified Buyer
    Molecular Repair Hair Oil
    Reviewing
    Molecular Repair Hair Oil
    I recommend this product
    Age 35 - 44
    Hair Concern Fragile/brittle hair
    Hair Type Medium Density
    My Results Smoother Hair
    Rated 5 out of 5 stars
    1 month ago
    Love this oil

    A little bit goes a long way! Helped heal my hair.

    K Profile picture for K18Hair
    K18Hair
    1 month ago

    We appreciate your 5-star review!

  • Paul M.
    Verified Buyer
    hair oil sample
    Reviewing
    hair oil sample
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    Shine

    The K18 oil sample put extra shine on my mothers hair. She has dry chemical damaged hair that I have taken over the care of. She is getting amazing results with all of the k18 products.

    K Profile picture for K18Hair
    K18Hair
    1 month ago

    Your mother is blessed to have children who want the best for her! We appreciate your review!

Reviews LoadedReviews Added
Pro Distribution Partners

Paramount Beauty Supply
USA
Salon Services Pro
USA
Salon Service Group
USA
Salonwax Pro
USA
Premier Beauty Supply
USA
Launching Soon
Ozdare - Australia
AU
 
Launching Soon
American Crew Ltd. - New Zealand
NZ
 
Launching Soon
PlayGround - Hong Kong
HK
 
Launching Soon
Session Map - Sweden
SE
 
Launching Soon
Cyprus
CY
 
Launching Soon
Belgium
BE
 
Coming Early 2021
Canada
CA
 
Coming Early 2021
Czech Republic
CZ
 
Coming Early 2021
Finland
FI
 
Coming Early 2021
France
FR
 
Coming Early 2021
Germany
DE
 
Coming Early 2021
Ireland
IR
 
Coming Early 2021
Italy
IT
 
Coming Early 2021
Netherlands
NL
 
Coming Early 2021
Norway
NO
 
Coming Early 2021
Singapore
SG
 
Coming Early 2021
Taiwan
TW
 
Coming Early 2021
UK
UK
 
Coming Early 2021
thank you for visiting!

You are now being redirected to an official partner website for this region where you can shop K18 Hair.

Changed your mind? Go back.

00:00
Blackfire Tracking
subscribe + save 15%
healthy hair on your schedule
Pick your K18 + how often you want to replen.
We’ll send you a heads up before every delivery.
You’re in charge. Change the way you pay, skip a shipment, or cancel anytime.