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molecular repair hair oil
before + after k18 routine and 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
K18 routine guide
4.7
Rated 4.7 out of 5 stars
639 Reviews

mini 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
7,870 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 639 reviews
639 reviews
  • Megan R.
    Verified Buyer
    hair oil sample
    Reviewing
    hair oil sample
    I recommend this product
    Rated 5 out of 5 stars
    3 weeks ago
    Soft and Shiny!

    I recently bought the shampoo, conditioner and leave in treatment and this sample was included in the box. It made my hair so shiny that I decided to go back and buy a full size bottle. I love all my K-18 purchases so far. It has made my hair so soft and shiny.

    K Profile picture for K18Hair
    K18Hair
    3 weeks ago

    Thank you Megan! We appreciate your 5-star review!

  • Amy G.
    Verified Buyer
    hair oil sample
    Reviewing
    hair oil sample
    I recommend this product
    Rated 5 out of 5 stars
    4 weeks ago
    Magic for fine damaged hair

    Worked very nicely to repair both my straight and curly styles. Used in conjunction with both the clarifying shampoo and repair mask. Will be buying the full sizes!

    K Profile picture for K18Hair
    K18Hair
    4 weeks ago

    🤩 Thank you Amy!

  • Tania K.
    Verified Buyer
    Molecular Repair Hair Oil
    Reviewing
    Molecular Repair Hair Oil
    I recommend this product
    Age 35 - 44
    Hair Concern Chemical damage
    Hair Type Fine/Thin
    My Results Stronger Hair, Soft Touchable Hair, Visible Difference
    Rated 5 out of 5 stars
    4 weeks ago
    Magic

    Is the best ever

    K Profile picture for K18Hair
    K18Hair
    4 weeks ago

    Thank you Tania! We appreciate your review!

  • Keri C.
    Verified Buyer
    hair oil sample
    Reviewing
    hair oil sample
    I recommend this product
    Rated 5 out of 5 stars
    1 month ago
    New

    Before I received K18, my hair was braking at the touch. I have now used K18 for couple weeks and the change is amazing my hair is soft again coming back to life and I don't have to worry bout if I touch my hair it will brake off as it is not.

    K Profile picture for K18Hair
    K18Hair
    1 month ago

    Healthy hair feels amazing! Thank you for your review!

  • Brooklyn J.
    Verified Buyer
    mini molecular repair hair oil
    Reviewing
    mini molecular repair hair oil
    I recommend this product
    Age 25 - 34
    Hair Concern Dryness, Frizz, Split-Ends, Fragile/brittle hair
    Hair Type Medium Density, Curly/Coily
    My Results Smoother Hair, Less Breakage, Visible Difference
    Rated 5 out of 5 stars
    1 month ago
    The BEST oil

    My hair is so dry, this oil has absolutely changed my hair!

    K Profile picture for K18Hair
    K18Hair
    1 month ago

    Your review is the best! Your hair looks🔥!

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