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K18

K18 Molecular Repair Hair Oil, Weightless Oil for Stronger, Healthier Hair, Suitable For All Hair Types

4.4 out of 5 stars 1,534 ratings
K18
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$65.00 $65.00 per fluid ounce
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Purchase options and add-ons

Product Benefits Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all See more
Hair Type All
Material Type Free Silicone Free
Scent Unscented
Liquid Volume 1 Fluid Ounces

Description

This biotech-engineered oil works on all hair types to strengthen, repair damage & improve shine at two levels of the hair fiber. Weightless & silicone-free, this oil repairs damage that causes frizz long-term

Benefits

Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all

Suggested use

Apply 1-3 drops to damp hair, starting at mid-length & working into the ends. Wait 4 minutes. Lastly, use 1-3 drops on dry hair as finisher
Complete the regimen
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K18 Molecular Repair Hair Oil, Weightless Oil for Stronger, Healthier Hair, Suitable For All Hair Types
This item: K18 Molecular Repair Hair Oil, Weightless Oil for Stronger, Healthier Hair, Suitable For All Hair Types
$65.00 ($65.00/fluid ounce)
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K18 Damage Shield Protective Conditioner, Protects Hair from Daily Damage, Improves Strength & Shine, 8.5 Fl Oz
$36.00 ($4.24/fluid ounce)
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Product Description

hair oil
The video showcases the product in use.The video guides you through product setup.The video compares multiple products.The video shows the product being unpacked.

K18 Molecular Repair Hair Oil

Merchant Video
hair oil
k18 hair routine

  • 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.

  • 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.

  • 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.

  • 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.

Shop the K18 Collection

Molecular Repair Oil

Molecular Repair Mask

Damage Shield Conditioner

Detox Shampoo

Buying Options

Damage Shield Shampoo

Buying Options

AirWash Dry Shampoo

AstroLift Volume Spray

Customer Reviews
4.4 out of 5 stars 1,534
4.3 out of 5 stars 23,925
4.5 out of 5 stars 758
4.6 out of 5 stars 1,543
4.4 out of 5 stars 695
4.2 out of 5 stars 343
4.2 out of 5 stars 30
Price
$65.00 $75.00 $36.00 — — $48.00 $46.00
Molecular Repair
✔ ✔ ✘ ✘ ✘ ✘ ✔
Maintenance Routine
✘ ✘ ✔ ✘ ✔ ✔ ✔
Treatment Routine
✔ ✔ ✘ ✔ ✘ ✘ ✘
Used By Professionals
✔ ✔ ✔ ✔ ✔ ✔ ✔
At Home Use
✔ ✔ ✔ ✔ ✔ ✔ ✔

Product details

  • Product Dimensions ‏ : ‎ 1.5 x 1.5 x 4 inches; 2.4 ounces
  • Item model number ‏ : ‎ K18-32011
  • UPC ‏ : ‎ 858511001500
  • Manufacturer ‏ : ‎ K18 Hair
  • ASIN ‏ : ‎ B0BYT7QCFB
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.4 out of 5 stars 1,534 ratings

Customer reviews

4.4 out of 5 stars
1,534 global ratings

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Customers say

Customers find the hair oil effective at taming frizz and repairing damage, with one noting it works well on dry, damaged hair. The product leaves hair soft and silky smooth, and customers report it makes their hair look shiny without a greasy appearance. While the quality receives positive feedback, opinions about value for money are mixed, with several customers finding it not worth the price. Customers disagree on the smell, with some finding it nice while others describe it as bad. The product's durability receives mixed reviews, with some saying it lasts a long time while others report breakage issues.

Select to learn more

EffectivenessSoftnessShineQualityDamage repairSmellBrittlenessValue for money
58 customers mention "Effectiveness"48 positive10 negative

Customers find the hair oil effective, particularly noting its success in taming frizz.

"...I only need a tiny bit. It helps a lot with frizz, especially when I straighten my hair. Doesn’t leave that greasy finish like some other oils." Read more

"...I use it on dry and towel dried hair. Helps with frizzy ends. A little goes a long way." Read more

"I got to have hair product works amazingly!" Read more

"...It really seems to be strengthening my hair and there's little to NO hair on my brush to prove it...." Read more

53 customers mention "Softness"50 positive3 negative

Customers find the hair oil makes their hair soft and silky smooth, particularly noting its effectiveness on frizzy and naturally curly hair.

"...I’ve been trying it for a few days and it leaves my hair soft without feeling heavy. I only need a tiny bit...." Read more

"I LOVE this hair oil. My hair is so smooth and so light weight with it in. Just 3-4 drops makes a huge difference." Read more

"...to do the ends of your hair...after it dries, you will see your hair have more bounce and seem fuller plus the ends of your hair will be less dry...." Read more

"Helps make it smooth and repaired. Too $$$ though might not buy again unless it’s on sale." Read more

28 customers mention "Shine"25 positive3 negative

Customers love the shine this hair oil provides, noting that their hair has never been so shiny. One customer mentions that it adds shine without weighing down or looking greasy.

"...With all the buzz surrounding this sleek, science-forward brand and the premium price tag, I expected a transformative experience...." Read more

"...Damage from Bleach, Color, Chemical Services & Heat, helped me get my wavy hair looking and feeling soft after being extremely dry due to colouring..." Read more

"...problems with breakage and flyaways, but now she's loving the way her hair looks and feels." Read more

"...My hair is softer and shines. I'm anxious to see how it will be in a few weeks." Read more

22 customers mention "Quality"22 positive0 negative

Customers find this hair oil to be of top quality.

"Great product but you can get it at Temu for about $10." Read more

"Bought this after a recommendation from my hair stylist. It’s incredible. Buy the big bottle!" Read more

"I love the quality of this product… all k18 are the best for frizzy, dry hair" Read more

"This is a great product. I use it when I straighten my hair." Read more

17 customers mention "Damage repair"12 positive5 negative

Customers find the hair oil effective for repairing damage, with one customer noting it works well on both towel-dried and dry hair, while another mentions it restores moisture.

"Great product for dry damage hair. I use it on dry and towel dried hair. Helps with frizzy ends. A little goes a long way." Read more

"This product, with K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat,..." Read more

"...It did not detangle, did not smooth, and did not protect. ⸻ Why It Doesn’t Work (at least not for fragile hair):..." Read more

"With continued use, this hair oil WILL reverse the damage that causes frizz." Read more

24 customers mention "Smell"16 positive8 negative

Customers have mixed opinions about the hair oil's smell, with some finding it pleasant while others describe it as bad.

"...Let’s give credit where it’s due. The fragrance is very mild, almost undetectable—something I appreciate in leave-in products...." Read more

"...The only downside that I would say is that the oil is very strong smelling. It is not a bad smell, but it is very strong" Read more

"...This is a tiny bottle and pretty expensive for the amount provided. Scent is light and not greasy. I have long thick hair so it doesn't go a long way." Read more

"It smells nice and seems to really smooth my hair well, but they recommend using 3 drops...." Read more

16 customers mention "Brittleness"9 positive7 negative

Customers have mixed experiences with the hair oil's effect on brittleness, with some reporting it lasts a long time, while others mention breakage of various lengths.

"...It really seems to be strengthening my hair and there's little to NO hair on my brush to prove it...." Read more

"...It is not a bad smell, but it is very strong" Read more

"...this oil, I know the price might seem steep, but it last literally forever I think I use 4 drops a day and I have had the same bottle for 10 months...." Read more

"...And it continues to be active in hair which continues hair breaking off!! Buyer beware of this product line even used as directed...." Read more

52 customers mention "Value for money"12 positive40 negative

Customers find the hair oil to be not worth the price, with multiple reviews mentioning the tiny bottle size.

"...works on all my ends so a little goes a long way but it’s still really expensive which I feel like you could find other products that do the same..." Read more

"Very expensive. I have noticed my hair feels some softer when using this product. Wish I got more for the money." Read more

"...Definitely not worth the price—1 star." Read more

"...super expensive but definitely worth it. I took a star away only because of how small this $30 bottle is. Very tiny" Read more

K18 moclecular repair hair oil
5 out of 5 stars
K18 moclecular repair hair oil
I have dry frizzy hair and I have tried a ton of products. But I would have to say that this K18 molecular repair hair oil smells amazing and has been an immense game changer. This oil is very lightweight and effective a little goes along way I have wavy mid length hair and like I said it’s dry and frizzy 90% of the time but since I’ve been using this, my waves are more defined Hair is nowhere near frizzy they used to be and I would also like to mention that I’m a Hijab so there is a lot going on underneath the Hijab so but I really like this product. It has transformed my hair for the better. It has nourished my hair trans from the outside, and I have noticed a huge difference in the appearance of my hair and the health of my hair since using this hair oil and yes, the bottle is extremely small but I have had this for almost a month now and I still have a lot in the bottle so I can see this lasting a good while using it mindfully because it is a tiny bottle, but don’t go overboard because you really do not need a lot of this product in your hair to see results.
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Top reviews from the United States

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  • Daniela Berliner
    5.0 out of 5 stars Nice texture, no grease
    Reviewed in the United States on June 28, 2025
    Size: 0.34 Fl OzVerified Purchase
    I like it so far
    I’ve been trying it for a few days and it leaves my hair soft without feeling heavy. I only need a tiny bit. It helps a lot with frizz, especially when I straighten my hair. Doesn’t leave that greasy finish like some other oils.
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  • Kaelyn Miller
    5.0 out of 5 stars great oil for damage
    Reviewed in the United States on May 29, 2025
    Size: 0.34 Fl OzVerified Purchase
    This product is a must for my hair now. I have low porosity very dry damaged hair with many split ends and it works, my hair instantly feels more healthy, it increases the moisture in the dry ends, 3 drops works on all my ends so a little goes a long way but it’s still really expensive which I feel like you could find other products that do the same for the same price, I just haven’t found any. It is a pretty heavy oil so I don’t recommend for everyone and it can cause too much oiliness! It’s pretty small amount they give lasts me like a couple months the small size
    5 people found this helpful
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  • Amanda
    5.0 out of 5 stars Smooth & light weight
    Reviewed in the United States on July 2, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    I LOVE this hair oil. My hair is so smooth and so light weight with it in. Just 3-4 drops makes a huge difference.
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  • TINA ADAMS
    5.0 out of 5 stars Smooths the frizz
    Reviewed in the United States on June 30, 2025
    Size: 0.34 Fl OzVerified Purchase
    Great product for dry damage hair. I use it on dry and towel dried hair. Helps with frizzy ends. A little goes a long way.
    Helpful
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  • Mindy
    4.0 out of 5 stars Very expensive
    Reviewed in the United States on June 23, 2025
    Size: 0.34 Fl OzVerified Purchase
    Very expensive. I have noticed my hair feels some softer when using this product. Wish I got more for the money.
    One person found this helpful
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  • Neroliza
    5.0 out of 5 stars La calidad del producto
    Reviewed in the United States on June 13, 2025
    Size: 0.34 Fl OzVerified Purchase
    Tiene un olor muy rico y suave
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  • Roxi
    1.0 out of 5 stars Expensive and Ineffective
    Reviewed in the United States on April 1, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    I had high hopes for the K18 Repair Hair Oil, especially since I purchased the entire K18 line. The shampoo, conditioner, detox shampoo, leave-in mask, and this oil. While I absolutely love the detox shampoo and leave-in mask, this oil was a complete letdown.

    For $65, I expected noticeable results, but I saw and felt no difference in my hair. It didn’t provide the level of repair, softness, or shine I was hoping for. Given how effective other K18 products have been for me, this one was especially disappointing. Definitely not worth the price—1 star.
    17 people found this helpful
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  • VanillaPepper
    3.0 out of 5 stars Subtle Scent, Serious Letdown – Left My Hair Drier Every Time
    Reviewed in the United States on May 26, 2025
    Size: 0.34 Fl OzVerified Purchase
    Give it three stars because so many people love it but personally I think it’s horrible especially for people with over processed hair and I had high hopes for the K18 Molecular Repair Hair Oil. With all the buzz surrounding this sleek, science-forward brand and the premium price tag, I expected a transformative experience. What I got was a subtle-scented, high-end disappointment that made my overprocessed, thinning blonde hair worse—not better.

    Here’s what happened:

    ⸻

    Scent: Clean and Subtle

    Let’s give credit where it’s due. The fragrance is very mild, almost undetectable—something I appreciate in leave-in products. It won’t compete with your perfume or irritate a sensitive scalp. I thought this was a promising sign.

    ⸻

    Performance: Left My Hair Feeling Even Drier

    My hairdresser first used this oil on me, thinking it might help after color treatment. It didn’t feel hydrating at all. I brought a sample home and gave it several chances, applying it to damp and dry hair alike—but each time, my hair felt rougher, not softer.

    Instead of sealing moisture, it seemed to highlight the brittleness of my ends. Even small amounts left my hair looking dull, weighed down, and more prone to frizz, not less. It did not detangle, did not smooth, and did not protect.

    ⸻

    Why It Doesn’t Work (at least not for fragile hair):
    • No nourishing slip—lacks that emollient softness good oils provide
    • Too light for dry or porous hair, yet somehow still left a residue
    • Claims to “repair” or “shield” just didn’t hold up in real use
    • Doesn’t layer well with other products—caused buildup and texture issues

    ⸻

    Price vs. Performance: Overhyped and Overpriced

    This is a luxury price for lackluster results. I’ve tried many products—from clinical-grade formulas to budget oils—and I rarely return something this quickly. Thankfully, because I’d tried a sample and already knew it didn’t work for me, I was able to return the full-size bottle unopened once my Amazon order arrived.

    ⸻

    My Hair Type:

    Fine, thinning, dry, overprocessed blonde—and currently under dermatologist care. I’ve had success rebuilding my hair’s strength and moisture balance with the right mix of products. This was not one of them.

    ⸻

    Bottom Line:

    If your hair is damaged, brittle, or color-treated, I don’t recommend this oil. It didn’t deliver on any of its promises and actively made my hair feel worse.

    Follow me for honest, experience-based reviews. I test both luxury and affordable options for stressed-out hair—so you don’t waste time or money on products that don’t work.

    ⸻

    Full Ingredients (from official label):

    Caprylic/Capric Triglyceride, Dimethicone, C13-15 Alkane, Bis-Hydroxy/Methoxy Amodimethicone, Isododecane, Isoamyl Laurate, Fragrance (Parfum), Tocopherol, Schinziophyton Rautanenii Kernel Oil, Squalane, Phytosteryl Macadamiate, Cocos Nucifera (Coconut) Oil, Oryza Sativa (Rice) Bran Oil, Simmondsia Chinensis (Jojoba) Seed Oil, Hydroxypropyl Gluconamide, Hydroxypropylammonium Gluconate, Citric Acid, Benzyl Salicylate, Limonene, Linalool.
    9 people found this helpful
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Top reviews from other countries

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  • Bonny
    5.0 out of 5 stars 10 de 10
    Reviewed in Mexico on May 19, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    Tengo decoloración en todo mi cabello, y este aceite no mancha mi rubio como otros aceites tipo moroccanoil.
    Report
  • Client d'Amazon
    5.0 out of 5 stars Restructure les cheveux abîmés
    Reviewed in Belgium on January 5, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    En combinaison avec le k18 crème restructuration sublime les cheveux abîmés ou ternes. Les rends soyeux et brillants.
    Report
  • Lucie Homolkova
    5.0 out of 5 stars Öl pflege
    Reviewed in Germany on June 10, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    Sehr gut, leicht zu kämmen
    Report
  • Cliente Amazon
    3.0 out of 5 stars Was expecting more
    Reviewed in Spain on October 20, 2024
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    I love the K18 mask and was expecting the same… not so impactful.
    Report
  • Hélène
    5.0 out of 5 stars Très bien tient ses promesses
    Reviewed in France on December 29, 2024
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    En associations avec le masque de la même marque. Les cheveux sont doux, lumineux et l'effet antistatique est bien là !
    J'ai les cheveux mi longs ondulés et épais, à la base plutôt ternes et difficiles à discipliner. Je recommande ce produit.
    Report