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molecular repair hair oil

Weightless oil that strengthens, repairs damage + reduces frizz
Rated 4.8 out of 5
Based on 207 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 clinically proven damage repair
  • 24-HR frizz control 24-HR frizz control
  • 104% more shine 104% more shine
  • 78% reduction in split ends 78% reduction in split ends
  • 450°F (232°C) heat protection 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 50mLFull-Size Leave-In Molecular Repair Hair Mask 50mL

full-size leave-in molecular repair hair mask

Rated 4.6 out of 5
Based on 7055 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.

the science behind molecular repair

This K18PEPTIDE™-powered oil fights frizz differently for long-term frizz prevention and immediate control.

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 Hair Oil
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
Full-Size Leave-In Molecular Repair Hair Mask 50mL
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

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.
reviews
average rating 4.8 out of 5
Based on 207 reviews
  • 5 Stars
    174 Reviews
  • 4 Stars
    22 Reviews
  • 3 Stars
    7 Reviews
  • 2 Stars
    3 Reviews
  • 1 Star
    1 Review
95% of reviewers would recommend this product to a friend
Customer photos and videos
207 Reviews
Reviewed by Melissa F.
Verified Buyer
I recommend this product
Age
25 - 34
Hair Concern
  • Split-Ends
  • Fragile/brittle hair
Hair Type
  • Fine/Thin
  • Straight/Wavy
My Results
  • Less Frizz
  • Soft Touchable Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Bang for your buck!

A little goes a long way! And we love that!

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K18Hair

Wow your hair looks amazing! Thank you for your review!

Reviewed by Grace H.
Verified Buyer
I recommend this product
Age
18 - 24
Hair Concern
  • Chemical damage
  • Fragile/brittle hair
  • Dryness
  • Split-Ends
Hair Type
  • Fine/Thin
  • Straight/Wavy
My Results
  • Visible Difference
  • Smoother Hair
  • Soft Touchable Hair
  • Stronger Hair
  • Defined Curl/Wave Pattern
Rated 5 out of 5
Review posted

Great Product!

I’ve been using this oil for about a week and already notice a difference in the health of my hair. I’ve tried numerous other hair oils and none have made a difference like this one. I use about 2-3 drops on dry hair. I like the scent because it’s very subtle and clean-smelling.

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K18Hair

Thank you for your review Grace!

Reviewed by Francine F.
Verified Buyer
Age
55 - 64
Hair Concern
  • Chemical damage
  • Color-care
  • Fragile/brittle hair
  • Dryness
Hair Type
  • Fine/Thin
My Results
  • Smoother Hair
Rated 3 out of 5
Review posted

Hair oil

Bought the hair mask and absolutely loved it, made my hair feel great. So I figured I would order the hair oil, well that has not done for my hair what the hair mask has. I don”t really care for it at all does not provide the softness that the hair mask has.

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K18Hair

We are sorry to hear you are not loving your results. Please reach out to us via email to Hello@K18Hair.com.

Reviewed by Melissa C.
Verified Buyer
I recommend this product
Age
65+
Hair Concern
  • Chemical damage
  • Color-care
  • Frizz
  • Fragile/brittle hair
  • Dryness
Hair Type
  • Straight/Wavy
  • Medium Density
My Results
  • Visible Difference
  • Stronger Hair
  • Less Breakage
  • Smoother Hair
  • Shinier Hair
Rated 5 out of 5
Review posted

Keeper!

Great stuff! It's clear so it doesn't discolor my blonde hair. The bottle is clear so I always know how much is left in it. The oil is heavy enough to help but light enough to keep my hair from looking greasy. This product is a keeper.

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K18Hair

Thank you for your review Melissa!

Reviewed by Joann P.
Verified Buyer
I recommend this product
Age
45 - 54
Hair Concern
  • Fragile/brittle hair
Hair Type
  • Grey Hair
My Results
  • Less Frizz
Rated 5 out of 5
Review posted

Dry hair

It is one of the best products I’ve tried for my extensions

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K18Hair

We love using the oil on extensions! Thank you for your review!

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