best seller
Rated 4.8 out of 5 stars
766 Reviews
K18 molecular repair hair oil
Weightless oil that strengthens, repairs damage + reduces frizz
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.
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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
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.
| clinically proven damage repair* | |
| 24-HR frizz control* | |
| 104% more shine* | |
| 78% reduction in split ends* | |
| 450°F (232°C) heat protection* |
*Disclaimers
**after K18 routine + oil - K18 detox shampoo, molecular repair mask, oil on damp hair, blow dry, oil on dry hair
| clinically proven damage repair* | |
| 24-HR frizz control* | |
| 104% more shine* | |
| 78% reduction in split ends* | |
| 450°F (232°C) heat protection* |
*Disclaimers
**after K18 routine + oil - K18 detox shampoo, molecular repair mask, oil on damp hair, blow dry, oil on dry hair
| clinically proven damage repair* | |
| 24-HR frizz control* | |
| 104% more shine* | |
| 78% reduction in split ends* | |
| 450°F (232°C) heat protection* |
*Disclaimers
**after K18 routine + oil - K18 detox shampoo, molecular repair mask, oil on damp hair, blow dry, oil on dry hair
how to use it
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
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
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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
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
simplicity
speed
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.
feel what's possible with K18
See how K18 unlocks our community's expression
Reviews Summary
Generated by AI from 100 most recent customer reviews
Last updated 2 days ago
Customers say this hair oil is lightweight and effective for managing frizz. Many reviews mention that just a few drops are sufficient, with the product working well on various hair types from fine to coarse. Users particularly note how it smooths flyaways and adds shine without feeling greasy. Common feedback includes its effectiveness on both straight and curly hair textures. While most find it transformative for their hair, a few mention the scent is strong and some wish for a thicker consistency.
766 reviews
- Jennifer B.Verified BuyerReviewinghair oil sampleI recommend this productRated 5 out of 5 stars2 weeks agoBest hair oil and protection for my hair
Love this oil helps.my hair so much, I wasnt fosure about this hair oil, as I've tried many in the past! This is the best hair oil I've tried and I can't wait to buy the full-size.
KK18Hair2 weeks agoWe agree! Thank you Jennifer!
- Morgan P.Verified BuyerReviewingMini molecular repair hair oilI recommend this productAge 25 - 34Hair Concern DrynessHair Type Fine/ThinMy Results Cleaner, fresher hairRated 5 out of 5 stars2 weeks agoSo helpful!
Love it! So nice and healthy
KK18Hair2 weeks agoThank you for your 5-star review!
- Lauren M J.Verified BuyerReviewinghair oil sampleI recommend this productRated 5 out of 5 stars1 month agoGreat final touch for processed hair!
I lighten and color my hair a lot, so this oil has been a life saver for my ends. I use it after the mask after washing my hair.
KK18Hair1 month agoWe love that our Molecular Repair oil is buildable and can be added as needed to smooth hair and before restyling. We appreciate your review!
- Jennifer S.Verified BuyerReviewingMini molecular repair hair oilI recommend this productAge 45 - 54Hair Concern Chemical damage, Color-care, Frizz, Split-Ends, DrynessHair Type Medium Density, Straight/WavyMy Results Less Frizz, Less Breakage, Smoother Hair, Soft Touchable Hair, Shinier HairRated 5 out of 5 stars1 month agoLove this hair oil
This hair oil is the best, my hair feels so soft and shiny!
KK18Hair1 month agoWe agree it is the best! Thank you for your review!
- Shauna R.Verified BuyerReviewingMolecular Repair Hair OilI recommend this productAge 55 - 64Hair Concern Chemical damageHair Type Medium DensityMy Results Visible Difference, Smoother Hair, Shinier Hair, Soft Touchable Hair, Less FrizzRated 5 out of 5 stars1 month agoi love my hair again
my hair was looking bad k18 fixed my hair it’s heathy and shinny looking again
thank you k18 nothing compares to k18 i love it
KK18Hair1 month agoWe love this for you! Thank you Shauna!
