K18 Molecular Repair Hair Oil, Weightless Oil for Stronger, Healthier Hair, Suitable For All Hair Types
Condition: New
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$10.83
/ mo
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- – 6-month term
- – No impact on credit to apply
- – Instant approval decision
- – Secure and straightforward checkout
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Learn more about financing & leasing here.
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FREE 30-day refund/replacement
To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
Availability:
In Stock.
Arrives
Saturday, May 23
Size: Full Size - 1 Fl Oz
Features
- Reverses frizz-causing damage: works at the molecular level to repair damaged hair, which is more susceptible to frizz
- Reduces frizz + flyaways: natural oils work on the surface of the hair to smooth the cuticle + soften without weighing hair down
- Enhances shine + color vibrancy: nourished, moisturized hair reflects higher shine and boosts color dimension
- To prevent further frizz-causing damage up to 450f (232c)
- Strengthening, smoothing hair oil works on two levels of the hair fiber to fight frizz.
Product Dimensions : 1.5 x 1.5 x 4 inches; 2.4 ounces
Item model number : K18-32011
UPC :
Manufacturer : K18 Hair
Best Sellers Rank: #3,173 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #29 in Hair Treatment Oils
#29 in Hair Treatment Oils:
Customer Reviews: 4.3 4.3 out of 5 stars (2,717)
Product Benefits: Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all
Hair Type: All
Scent Name: Unscented
Item Form: Oil
Liquid Volume: 1 Fluid Ounces
Number of Items: 1
Unit Count: 1.0 Fluid Ounces
Item Volume: 30 Milliliters
Brand Name: K18
Manufacturer: K18 Hair
UPC: 858511001500
Global Trade Identification Number: 00
Item Weight: 0.15 Pounds
Material Type Free: Silicone Free
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Saturday, May 23
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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- Affirm Financing
- Afterpay Financing
- PayTomorrow Financing
- Financing through Apple Pay
Learn more about financing & leasing here.
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Top Amazon Reviews
Size: Travel Size - 0.34 Fl Oz
This works well and has a pleasant smell, it doesn’t leave my hair too oily.
Reviewed in the United States on April 27, 2026 by Frustrated
Size: Full Size - 1 Fl Oz
Much more expensive compared to ogx and olaplex but worth the money. my hair is naturally almost black and 2c but I bleached it platinum. Its fried. Conditioners don’t make a difference for my hair but this (with olaplex 6) makes my hair look healthy again :-) I get compliments on how pretty my hair is and it’s returned to its curl. It takes like a hour for it to actually soften my hair up (my hair is low porosity). It’s not greasy and very lightweight. It has a very faint shampoo-generic smell but it doesn’t linger on hair. The 0.34oz lasted like 3 months so I decided it was worth it to invest in the full size. I recommend this line, specifically the oil and mask, to everyone I know who has been trying to make matrix and olaplex work for years lmao
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Reviewed in the United States on March 20, 2026 by X O
Size: Travel Size - 0.34 Fl Oz
You only need a few drops so that small pricey bottle should last a long time. And it really works well to tame frizzy hair with the added benefit of a beautiful shine.
Reviewed in the United States on April 24, 2026 by Stacy Allison
This stuff has absolutely saved my hair. I'm a huge fan of the K18 mask to start with and after going a little too hard while touching up my blonde highlights my hair was in major need of repair. I got this as it had the oil included and OH MY GOD can you tell the difference. Both of these products are absolute powerhouses! If your hair has any damage at all or is in need of moisture I can't recommend it enough! Definitely expensive but worth it.
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Reviewed in the United States on December 15, 2025 by Izzie A
Size: Travel Size - 0.34 Fl Oz
It makes my hair look healthy, especially if my hair is super dry. The scent is fantastic! It makes my hair very soft, but use as little as possible, or else it will be super oily. The dropper makes it so easy to use, with dispersing too much product. I will say, it is very expensive for the amount you get. When they say it’s travel size, it sure is. I have thin hair, so I only need a little bit.
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Reviewed in the United States on December 22, 2025 by Morgan McBride
Size: Travel Size - 0.34 Fl Oz
I recently purchased the K18 Molecular Repair Hair Oil for my super dry hair, and I’m really impressed with how shiny and healthy it makes my hair look. The delivery was also incredibly fast - thank you.
Reviewed in the United States on April 9, 2026 by Izaya
Size: Travel Size - 0.34 Fl Oz
Well worth the money! I dye my hair frequently and this has helped change my hair for the better with way less breakage! Not greasy!
Reviewed in the United States on May 4, 2026 by Brittanie Olschewske
Size: Travel Size - 0.34 Fl Oz
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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Reviewed in the United States on May 26, 2025 by VanillaPepper