K18 molecular repair hair oil
Weightless oil that strengthens, repairs damage + reduces frizz
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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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.
Boost shine and seal split ends on all hair types—weightlessly.
Highly concentrated formula. Start with 1-3 drops and build as needed.
1. Apply 1-3 drops to towel-dried hair from mid-lengths to ends.
2. For strengthening benefits from the K18PEPTIDE™, wait 4 minutes before styling.
3. Apply 1-3 drops to dry hair as a finisher.
See how K18 unlocks our community's expression
- Frizz Control
- Shine
- Texture
- Weight
- Hair Health
- Christy H.Verified BuyerReviewingMini molecular repair hair oilI recommend this productAge 35 - 44Hair Concern Chemical damage, Heat damage, Color-care, Dryness, Fragile/brittle hairHair Type Fine/ThinMy Results Visible Difference, Stronger Hair, Smoother Hair, Shinier Hair, Cleaner, fresher hairRated 5 out of 5 stars1 month agoLeaves my hair manageable
I like this oil- I have long, bleached hair. It is thin, but I have a ton of it! The oil works wonders in making everything manageable after a wash and a little goes a long way!
KK18Hair1 month agoThank you so much for this wonderful review, Christy! We're absolutely thrilled to hear that you love the Mini molecular repair hair oil and that it's working wonders for your long, bleached hair! It's fantastic that you're experiencing how manageable it makes everything after a wash - that's exactly what we love to hear! We're also so excited that you've found a little goes such a long way with our concentrated formula. We're so grateful that you're loving the results and thanks for your amazing 5-star review! 💛
- Jennifer R.Verified BuyerReviewingMolecular Repair Hair OilAge 35 - 44Hair Concern Chemical damage, Heat damage, Fragile/brittle hairHair Type Straight/WavyMy Results Less FrizzRated 3 out of 5 stars2 months agoIt’s ok
It’s ok. I didn’t notice much improvement. My hair felt pretty dry after using but it did take my flyaways some
KK18Hair2 months agoThank you so much for taking the time to try the Molecular Repair Hair Oil and share your honest feedback, Jennifer! We appreciate you giving it 3 stars and are glad to hear that it helped with your flyaways.
We completely understand your disappointment that you didn't notice much improvement overall and that your hair felt dry after using the oil. It's frustrating when a product helps with one concern like flyaways but doesn't deliver the moisture and repair benefits you were hoping for, especially from a hair oil designed to nourish and hydrate.
Your feedback about the dryness versus the flyaway control is really valuable to us and helps us understand how the Molecular Repair Hair Oil performs differently for various hair types and concerns. Everyone's hair responds differently to treatments, and we appreciate you giving it a fair try and sharing your honest experience about what worked and what didn't.
- Sha T.Verified BuyerReviewingMini molecular repair hair oilI recommend this productAge 35 - 44Hair Concern Dryness, Oily hair/scalp, Heat damageHair Type Thick/CoarseMy Results Bouncy Hair, Less Frizz, Oil absorbed, Shinier HairRated 5 out of 5 stars2 months agoRecommend
Love the smell
KK18Hair2 months agoThank you so much for this wonderful review, Sha! 💛 We're absolutely thrilled to hear that you love the smell of the Mini molecular repair hair oil and that you'd recommend it! It's amazing that the scent is making such a great impression - that's exactly what we love to hear! We're so excited that you're loving the product and thanks for your fantastic 5-star review!
- Savannah R.Verified BuyerReviewinghair oil sampleI recommend this productRated 5 out of 5 stars3 months agoLove love love
So light and hydrating
KK18Hair3 months agoThank you so much for this amazing review, Savannah! We're absolutely thrilled to hear that you love our hair oil sample and that it's delivering that perfect lightweight, hydrating feel! It's wonderful that you're experiencing such fantastic results with the formula - that balance of being light yet deeply hydrating is exactly what we hoped to achieve! Your feedback truly means the world to us, and we're so grateful to have you as part of our K18 community!
- Christine C.Verified BuyerReviewingMolecular Repair Hair OilI recommend this productAge 55 - 64Hair Concern Dryness, Split-Ends, Chemical damage, Color-care, Heat damageHair Type Fine/ThinMy Results Visible Difference, Bouncy Hair, Stronger Hair, Less Breakage, Soft Touchable HairRated 5 out of 5 stars3 months agoMolecular Repair Oil
The K18 Molecular Repair Hair Oil is a lightweight, silicone-free oil that delivers real smoothing and frizz control while helping strengthen the hair from the inside out. It’s one of the few oils that feels treatment-first, styling-second — meaning it improves the hair’s condition over time, not just the way it looks.
KK18Hair3 months agoThank you so much for this incredible review, Christine! We're absolutely thrilled to hear that you're experiencing the true power of our Molecular Repair Hair Oil - that perfect combination of lightweight smoothing and frizz control while actually strengthening your hair from within! It's wonderful that you've noticed how this oil is truly treatment-first, styling-second, which is exactly what we aimed to achieve with this silicone-free formula. Your feedback about seeing real improvement in your hair's condition over time, not just temporary styling benefits, truly means the world to us! We're so grateful to have you as part of our K18 community!