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K18 Shampoo, Mask, OilK18 Hair

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

1,505 ratings

Amazon's Choice

$27.00 $79.41 per fluid ounce

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Size: 0.34 Fl Oz

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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

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

$27.00 ($79.41/fluid ounce)

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K18 Damage Shield Protective Shampoo, Reduces Frizziness & Tangles, Maintains Hair Health, 8.5 Fl Oz

$36.00 ($4.24/ounce)

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K18 AstroLift™ Reparative Volume Spray, 2-Day Hair Thickening + Hold For Thin, Fine, Fragile Hair, Non-Sticky, Non-Crunchy, Humidity-Resistant Volumizing Spray, 4 Fl Oz

$46.00 ($11.50/fluid ounce)

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Product Description

K18 Molecular Repair Hair Oil

Merchant Video

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.
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.
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.
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.

Shop the K18 Collection

	Molecular Repair Oil	Molecular Repair Mask	Damage Shield Conditioner Buying Options	Detox Shampoo Buying Options	Damage Shield Shampoo	AirWash Dry Shampoo	AstroLift Volume Spray
Customer Reviews	1,505	23,724	733	1,535	664	322	23
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 ‏ : ‎ 0.15 x 1.5 x 4 inches; 1.13 ounces
UPC ‏ : ‎ 858511000794
Manufacturer ‏ : ‎ K18
ASIN ‏ : ‎ B0CD84PNDD
Country of Origin ‏ : ‎ USA

Best Sellers Rank: #3,259 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care)
- #35 in Hair Treatment Oils

Customer Reviews:
1,505 ratings

Customer reviews

1,505 global ratings

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Customers say

Customers find the hair oil effective at taming frizz and appreciate how it makes hair feel silky smooth, with one customer noting it's particularly suitable for fine hair. The product receives positive feedback for its quality and ability to add shine without a greasy look. While some customers say it restores moisture to damaged ends, others report it makes their hair feel dry, and there are mixed opinions about the smell. Customers disagree on the product's value for money, with some finding it worth the price while others consider it overpriced.

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Effectiveness Softness Shine Quality Smell Moisture level Brittleness Value for money

56 customers mention "Effectiveness"46 positive10 negative

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

"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

"This works wonders on my hair!" Read more

"Works really well just wish it was actually unscented" Read more

50 customers mention "Softness"47 positive3 negative

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

"...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

"...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..." Read more

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

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

17 customers mention "Moisture level"11 positive6 negative

Customers have mixed experiences with the hair oil's moisture level, with some reporting that it restores moisture to their hair while others find it leaves their strands feeling dry.

"...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..." Read more

"...Performance: Left My Hair Feeling Even Drier My hairdresser first used this oil on me, thinking it might help after color treatment...." Read more

"...see your hair have more bounce and seem fuller plus the ends of your hair will be less dry...." 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

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

51 customers mention "Value for money"12 positive39 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

"10/10 I love this hair mask the size is too small but it works" Read more

"Not as good afterwards as the pump k18" 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

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Kaelyn Miller
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

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4 people found this helpful

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Neroliza
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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joan lanier
Hair product
Reviewed in the United States on June 12, 2025
Size: 0.34 Fl OzVerified Purchase
I got to have hair product works amazingly!

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Ruth
What to do with hair that needs body and bounce.
Reviewed in the United States on May 5, 2025
Size: 0.34 Fl OzVerified Purchase
Although the price of this K18 is high and the bottle is vey small, I use only a drop at a time to massage into my hair....don't forget 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. It does make a big difference in how your hair will have more shine and bounce than before.

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8 people found this helpful

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Mindy
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.

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Azucena landis
Hair oil
Reviewed in the United States on June 2, 2025
Size: 0.34 Fl OzVerified Purchase
10/10 I love this hair mask the size is too small but it works

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Roxi
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.

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13 people found this helpful

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VanillaPepper
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.

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7 people found this helpful

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Bonny
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.

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Client d'Amazon
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.

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Lucie Homolkova
Öl pflege
Reviewed in Germany on June 10, 2025
Size: 1 Fl Oz (Pack of 1)Verified Purchase
Sehr gut, leicht zu kämmen

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Cliente Amazon
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.

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Hélène
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.

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

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From the brand

Shop damage repair mask

Shop weightless dry shampoo

Shop shampoo + conditioner

Shop frizz-fighting hair oil

Product Description

K18 Molecular Repair Hair Oil

Can I use the Molecular Repair Hair Oil instead of the mask?

Does the Molecular Repair Hair Oil provide heat protection?

Will the Molecular Repair Hair Oil leave buildup or weigh down my hair?

Will the mask block the Molecular Repair Hair Oil from penetrating?

Can I mix the oil and mask together?

Shop the K18 Collection

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K18 moclecular repair hair oil

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5.0 out of 5 stars 10 de 10

5.0 out of 5 stars Restructure les cheveux abîmés

5.0 out of 5 stars Öl pflege

3.0 out of 5 stars Was expecting more

5.0 out of 5 stars Très bien tient ses promesses

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10 de 10

Restructure les cheveux abîmés

Öl pflege

Was expecting more

Très bien tient ses promesses