K18 Molecular Repair Hair Oil, Weightless Oil for Stronger, Healthier Hair, Suitable For All Hair Types
Condition: New
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- – 4-month term
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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
Wednesday, Jun 3
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Size: Travel Size - 0.34 Fl Oz
Features
- Dual-Action Frizz Control System: The perfect hair oil for frizzy hair, it targets frizz at two levels by reversing damage within the hair fiber and smoothing the cuticle surface for soft, manageable strands.
- Biotech-Engineered Oil for Hair: Clinically proven to repair damaged hair*, our patented K18PEPTIDE formula works at the innermost layer of hair to strengthen and reverse damage that leads to frizz.
- Lightweight + Shine-Enhancing: The weightless, silicone-free formula nourishes with avocado oil, sunflower oil, hemisqualane, and squalane to boost color vibrancy and increase hair shine by 104%* without buildup.
- Heat Protection up to 450F*: Designed to protect from heat styling tools, this hair oil heat protectant helps prevent further frizz-causing damage while reducing split ends by 78%*.
- How to Use: Start with 1-3 drops and build as needed. Apply to damp, towel-dried hair from mid-lengths to ends for repair + frizz control. Apply to dry strands as a hair finishing oil to smooth and add shine. Use after the K18 Molecular Repair Hair Mask to complete your hair strengthening routine.
Product Dimensions : 1.06 x 1.06 x 3.18 inches; 0.8 ounces
UPC :
Manufacturer : K18
Best Sellers Rank: #2,840 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #23 in Hair Treatment Oils
#23 in Hair Treatment Oils:
Customer Reviews: 4.3 4.3 out of 5 stars (2,786)
Product Benefits: Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all
Hair Type: Chemically Treated, Curly, Fine, Straight, textured-hair
Scent Name: Unscented
Item Form: Oil
Liquid Volume: 10 Milliliters
Number of Items: 1
Item Volume: 10 Milliliters
Brand Name: K18
Manufacturer: K18
UPC: 858511000794
Item Weight: 22.68 g
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Jun 3
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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- 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 product, and the mask, have saved my bleached hair!!! I cannot rave ENOUGH about these products. While they are not the most budget friendly, if you are looking to bring life back to your hair without buzzing it off, these are a must in your routine!
Reviewed in the United States on May 20, 2026 Reviewed in the United States on May 20, 2026 by Alexandra Stalker
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
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
I have been using both a couple times a week. My damaged hair seems to feeling a bit better. Not miracle products but I feel like they are helping a bit.
Reviewed in the United States on May 14, 2026 by Denise
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