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K18 molecular repair hair oil

Weightless oil that strengthens, repairs damage + reduces frizz
Rated 4.7 out of 5
Based on 360 reviews

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
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more to know

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

key benefits

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)

how to use

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.

ingredients

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 4.6 out of 5
Based on 7350 reviews
4-minute leave-in treatment to reverse hair damage View Full-Size Leave-In Molecular Repair Hair Mask 50mL product

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.

Can i use the molecular repair hair oil instead of the mask?

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.

Does the molecular repair hair oil provide heat protection?

Yes, this oil provides heat protection up to 450°F/232°C.

Will the molecular repair hair oil leave buildup or weigh down my hair?

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

Will the mask block the molecular repair hair oil from penetrating?

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.

Can I mix the oil and mask together?

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

  • how to use the oil
  • how to use the oil + K18 mask together
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
View Molecular Repair Hair Oil product
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
View Full-Size Leave-In Molecular Repair Hair Mask 50mL product

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 360 reviews
  • 5 Stars
    302 Reviews
  • 4 Stars
    35 Reviews
  • 3 Stars
    9 Reviews
  • 2 Stars
    6 Reviews
  • 1 Star
    8 Reviews
94% of reviewers would recommend this product to a friend
Customer photos and videos
360 Reviews
Reviewed by Sharon
I recommend this product
Rated 5 out of 5
Review posted

5 Stars

I love the product it works very well. Will buy again.

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

K18 oil

The best product ever used!

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

Hair oil…

I like this oil . It is weightless and helps with Friz.

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Reviewed by Kathleen M.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Heat damage
  • Frizz
  • Fragile/brittle hair
  • Split-Ends
  • Dryness
Hair Type
  • Fine/Thin
  • Straight/Wavy
My Results
  • Visible Difference
  • Shinier Hair
  • Less Breakage
  • Stronger Hair
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Saved my damaged hair

I don’t ever really write reviews but this product has been making such a big difference with my damaged hair. I had a lot of breakage from using a blow dry brush and general heat damage from not using heat protectant. I was frustrated trying many hair masks and products but then my hair dresser recommended this. It’s also great to help with my frizzy hair too.

This is by far the best hair product I’ve ever owned

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K18Hair

Thank you for your review, Kathleen!

Reviewed by Pranee P.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Frizz
  • Color-care
Hair Type
  • Medium Density
My Results
  • Less Frizz
  • Shinier Hair
  • Soft Touchable Hair
Rated 5 out of 5
Review posted

Shiny and soft hair for days

I have been using this product in between K18 mask and it has been one of the best products I’ve used to add shine and softness to my hair. What I love most is that is lasts between washings. Extremely happy with this product!

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K18Hair

Soft and Shiny is the way to go! Thank you Pranee for your review!

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