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K18

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

4.3 out of 5 stars 1,333 ratings
K18
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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 Frizz,Frizz―repairing
Material Type Free Silicone Free
Scent Unscented
Liquid Volume 30 Milliliters

Additional Details

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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/Fl Oz)
Get it as soon as Friday, May 2
In Stock
Sold by K18 Hair and ships from Amazon Fulfillment.
+
K18 PEPTIDE PREP™ Color-Safe Detox Clarifying Shampoo, Non-Stripping, pH-Optimized Cleanse, Removes Product Buildup, Dirt, Oi
$38.00 ($4.47/Fl Oz)
Get it as soon as Friday, May 2
In Stock
Sold by K18 Hair and ships from Amazon Fulfillment.
+
K18 Damage Shield Protective Conditioner, Protects Hair from Daily Damage, Improves Strength & Shine, 8.5 Fl Oz
$36.00 ($4.24/Fl Oz)
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From the brand

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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

Damage Shield Shampoo

AirWash

Customer Reviews
4.3 out of 5 stars 1,333
4.3 out of 5 stars 22,743
4.5 out of 5 stars 613
4.6 out of 5 stars 1,448
4.5 out of 5 stars 551
4.2 out of 5 stars 241
Price
$65.00 $75.00 $36.00 $38.00 $36.00 $48.00
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
  • ASIN ‏ : ‎ B0BYT7QCFB
  • Country of Origin ‏ : ‎ USA
  • Customer Reviews:
    4.3 out of 5 stars 1,333 ratings

Customer reviews

4.3 out of 5 stars
1,333 global ratings

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Customers say

Customers find the hair oil effective at taming frizz and making their hair feel silky smooth, with one customer noting it makes bleached blonde hair feel like butter. The product receives positive feedback for its quality, shine, and health benefits, with one customer mentioning it revitalizes curls in winter weather. Customers disagree on the product's value for money, with many finding it too small for the price. The smell and moisture level receive mixed reactions from customers.

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45 customers mention "Effectiveness"37 positive8 negative

Customers find the hair oil effective, particularly for taming frizz, and one customer mentions it works well for dry and damaged hair.

"...It helps tame the frizz and leaves my hair so silky smooth without and residue feeling...." Read more

"I have fine thin hair and this works great. I use 2-3 drops and leaves my hair shiny and soft without feeling or looking oily" Read more

"Works well!" Read more

"Works okay" Read more

45 customers mention "Hair softness"45 positive0 negative

Customers love how the hair oil makes their hair feel, describing it as soft, silky, and smooth, with one customer noting it makes bleached blonde hair feel like butter.

"...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

"...It helps tame the frizz and leaves my hair so silky smooth without and residue feeling...." Read more

"...n’t leave any greasy residue and just melts onto the hair leaving it silky soft...." Read more

"...I use 2-3 drops and leaves my hair shiny and soft without feeling or looking oily" Read more

24 customers mention "Hair health"24 positive0 negative

Customers report positive effects on their hair, noting it becomes healthier, softer, and more revitalized, with one customer specifically mentioning how it helped their curls stay fresh during winter weather.

"...years, but K18 hair oil and k18 leave-in hair mask has made my hair so much healthier and manageable...." Read more

"Don’t think twice just buy, k18 is the best product for hair health." Read more

"...My hair is pretty healthy already. Adds great shine. Too much and it’s too oily!" Read more

"Love it - hair became healthier!" 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

18 customers mention "Shine"15 positive3 negative

Customers love the shine of their hair after using this oil, with one customer noting that it adds shine without weighing it down or looking greasy.

"I have fine thin hair and this works great. I use 2-3 drops and leaves my hair shiny and soft without feeling or looking oily" Read more

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

"...My hair is pretty healthy already. Adds great shine. Too much and it’s too oily!" Read more

"...feeling nice moisture feeling very easy to use leaves hair soft and shinny" Read more

21 customers mention "Smell"14 positive7 negative

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

"...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

"...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

"...It was nice smelling and has an easy-going smell. It helped to take down my flyaways and smooth out my ends...." Read more

14 customers mention "Moisture level"9 positive5 negative

Customers have mixed experiences with the hair oil's moisture level, with some finding it hydrating for dry ends, while others report it leaves their hair feeling dry.

"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 seems my hair is very soft one day and the next time I use it very dry feeling. Same with the oil...." Read more

"Not heavy oil feeling nice moisture feeling very easy to use leaves hair soft and shinny" Read more

"...this product along with the k18 leave in my hair is silky, my ends are hydrated and it helps control the frizz from the summer humidity." Read more

43 customers mention "Value for money"12 positive31 negative

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

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

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

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

Nice oil for frizz
4 out of 5 stars
Nice oil for frizz
I like that this product was helpful for my frizz. It was nice smelling and has an easy-going smell. It helped to take down my flyaways and smooth out my ends. However, I do feel as if you have to be careful because a little goes a long way and if you put too much in, it does give you a greasy effect look.
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Top reviews from the United States

  • AMIH
    5.0 out of 5 stars It works perfectly
    Reviewed in the United States on February 23, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    This product, with K18 Leave-In Molecular Hair Mask, Repairs Dry or Damaged Hair, Reverse Hair Damage from Bleach, Color, Chemical Services & Heat, helped me get my wavy hair looking and feeling soft after being extremely dry due to colouring with a non chemical hair colour product. It took several weeks but considering how my hair was, it was magic. Plus, I have no problem with my sensitive scalp.
    9 people found this helpful
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  • Michaela
    5.0 out of 5 stars GREAT product!!
    Reviewed in the United States on January 30, 2024
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    The media could not be loaded.
    I am so glad I heard about k18 products. k18 makes a huge difference in my hair. My hair is naturally frizzy and gets really dry without any real reason (maybe from hard water), but after having my hair lightened with bleach it was much worse. I ended up with a ton of split ends and breakage which was really discouraging after growing my hair out for years, but K18 hair oil and k18 leave-in hair mask has made my hair so much healthier and manageable. It helps tame the frizz and leaves my hair so silky smooth without and residue feeling. If you use to many drops it will leave you hair lightly greasy, so just test out how many drops work for your hair type and length. My hair is to the middle of my back, I have fine, frizzy wavy, dry hair and I use 1-3 drops and I apply it to the ends of my hair and work it up half way (on some of the dryer spots I will add a little more to help repair that problem area). Then I brush my hair to make sure it gets on all hair strands. I like how it is heat safe and actually can help protect you hair from heat damage.
    72 people found this helpful
    Helpful
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  • Alisaoughton206
    5.0 out of 5 stars Just buy it.
    Reviewed in the United States on April 19, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    Don’t think twice just buy, k18 is the best product for hair health.
    One person found this helpful
    Helpful
     Report
  • Marissa
    5.0 out of 5 stars Silky
    Reviewed in the United States on March 27, 2025
    Size: 0.34 Fl Oz (Pack of 1)Verified Purchase
    Amazing. Doesn’t leave any greasy residue and just melts onto the hair leaving it silky soft. I have noticed a positive difference in my split needs since using this product.
    3 people found this helpful
    Helpful
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  • chloe
    4.0 out of 5 stars LOVE
    Reviewed in the United States on January 27, 2025
    Size: 0.34 Fl Oz (Pack of 1)Verified Purchase
    I have always hated Olaplex after I found k18. super expensive but definitely worth it. I took a star away only because of how small this $30 bottle is. Very tiny
    8 people found this helpful
    Helpful
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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.
    Helpful
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  • steve kosel
    5.0 out of 5 stars Great product for fine hair
    Reviewed in the United States on January 29, 2025
    Size: 0.34 Fl Oz (Pack of 1)Verified Purchase
    I have fine thin hair and this works great. I use 2-3 drops and leaves my hair shiny and soft without feeling or looking oily
    18 people found this helpful
    Helpful
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  • T. Knoll
    3.0 out of 5 stars Small K18 Hair
    Reviewed in the United States on March 3, 2025
    Size: 0.34 Fl Oz (Pack of 1)Verified Purchase
    Make sure to look at the OZ before purchase. 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.
    9 people found this helpful
    Helpful
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Top reviews from other countries

Translate all reviews to English
  • 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
  • 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
  • Michelle Vadeboncoeur
    2.0 out of 5 stars Vraiment pas
    Reviewed in Canada on March 27, 2025
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    Très chers et j’aime pas du tout, mes cheveux sont gros et crépus, ils les rends pire et gras, habituellement j’ai jamais les cheveux gras. Je vais continuer avec karastas, je croyais encourager un produits de chez nous mais j’aimerais bien un remboursement.
    Report
  • Lu
    5.0 out of 5 stars Excelente
    Reviewed in Mexico on January 23, 2024
    Size: 1 Fl Oz (Pack of 1)Verified Purchase
    Recomendable
    Report