best seller
Rated 4.8 out of 5 stars
725 Reviews
K18 molecular repair hair oil
Weightless oil that strengthens, repairs damage + reduces frizz
pairs well with
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full-size leave-in molecular repair hair mask
4-minute leave-in treatment to reverse hair damage
Rated 4.7 out of 5 stars
8,038 Reviews
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
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
725 reviews
- Dina P.Verified BuyerReviewinghair oil sampleI recommend this productRated 5 out of 5 stars7 hours agoShine
Definitely adds shine to my hair. And you only need a few drops
- Brittany H.Verified BuyerReviewinghair oil sampleI recommend this productRated 5 out of 5 stars3 weeks ago10/10
The ends of my hair were dry and damaged. They are looking so much healthier and softer.
KK18Hair3 weeks agoWe appreciate your review! Thank you Brittany!
- Patricia L.Verified BuyerReviewingMolecular Repair Hair OilI recommend this productAge 65+Hair Concern Frizz, Dryness, Heat damage, Split-Ends, Fragile/brittle hairHair Type Medium DensityMy Results Less Frizz, Visible Difference, Smoother Hair, Shinier HairRated 5 out of 5 stars3 weeks agoHair repair oil
My hair has improved It is less frizzy and easy to work with Love the fact that it isn’t a heavy product This product is a staple in my life. After photo on the left
KK18Hair3 weeks agoThe power of a lightweight product! Thank you Patricia!
- TANYA G.Verified BuyerReviewingMolecular Repair Hair OilI recommend this productAge 25 - 34Hair Concern Chemical damage, Frizz, Fragile/brittle hair, Dryness, Split-EndsHair Type Medium Density, Straight/WavyMy Results Visible Difference, Smoother Hair, Soft Touchable Hair, Less Breakage, Less FrizzRated 5 out of 5 stars4 weeks agomy holy grail
This is easily the ONE product I don't think I could go without in my hair routine. Regardless of the other products I use, this oil makes my waves smooth without weighing down & doesn't make my hair or scalp greasy. I don't have to apply multiple times between washes to keep the results, either. I kind of hate that it works so well for me bc of the price 🥲 but it's worth every penny.
KK18Hair3 weeks agoYou can notice the shine in your hair! Thank you Tanya!
- Jackie S.Verified BuyerReviewingMolecular Repair Hair OilI recommend this productAge 45 - 54Hair Concern Chemical damage, Color-careHair Type Thick/CoarseMy Results Less Frizz, Visible Difference, Less Breakage, Stronger Hair, Smoother HairRated 5 out of 5 stars1 month agoHailr oil
Love it
KK18Hair4 weeks agoThank you Jackie!
