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
Rated 4.7 out of 5
Based on 595 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
Rated 4.7 out of 5
Based on 7791 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.

reviews

average rating 4.7 out of 5
Based on 595 reviews
  • 5 Stars
    509 Reviews
  • 4 Stars
    47 Reviews
  • 3 Stars
    18 Reviews
  • 2 Stars
    8 Reviews
  • 1 Star
    13 Reviews
93% of reviewers would recommend this product to a friend
595 Reviews
Reviewed by CarolAnn W.
Verified Buyer
hair oil sample
Reviewing
hair oil sample
I recommend this product
Rated 5 out of 5
Review posted

K18 Hair oil

I LOVE this oil. It’s my new best friend. Leaves my hair silky shiny but without the oily feel. Can’t believe how amazing my hair feels and looks.

Loading...
Was this helpful?

K18Hair

Love the shine plus not feeling weighed down. Thank you for your review!

Reviewed by Kellsie W.
Verified Buyer
hair oil sample
Reviewing
hair oil sample
I recommend this product
Rated 5 out of 5
Review posted

Great

I love that this hair oil also has heat protection. For a sample the company is generous especially considering only a few drops are needed at a time

Loading...
Was this helpful?

K18Hair

We appreciate you! Less is more especially with our Molecular repair oil!

Reviewed by Annalisa M.
Verified Buyer
I recommend this product
Age
35 - 44
Hair Concern
  • Frizz
  • Fragile/brittle hair
Hair Type
  • Thick/Coarse
My Results
  • Stronger Hair
  • Less Breakage
  • Shinier Hair
Rated 5 out of 5
Review posted

Liquid gold

This is repairs and shines. Perfect duo

Loading...
Was this helpful?

K18Hair

Thank you for your 5-star review! We appreciate you Annalisa!

Reviewed by Carolyn S.
Verified Buyer
hair oil sample
Reviewing
hair oil sample
I recommend this product
Rated 5 out of 5
Review posted

Heat protection at its finest

Loved it- bought a bottle

Loading...
Was this helpful?

K18Hair

Thank you for your review! Heat protection is a must!

Reviewed by Shereen S.
Verified Buyer
I recommend this product
Age
55 - 64
Hair Concern
  • Heat damage
Hair Type
  • Medium Density
My Results
  • Less Frizz
Rated 5 out of 5
Review posted

Luxurious

Expensive for a hair oil but you don’t need much. It’s very light and makes the hair smooth. Can’t wait to try the other products too. Would buy again just wish it wasn’t so costly.

Loading...
Was this helpful?

K18Hair

Thank you for your review! To help with savings, we recommend our subscription to help save some money. The best part is you can schedule as frequently as you need and cancel anytime.

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.