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
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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, Sep 17
Style: Full Size - 1 Fl Oz
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
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: #2,895 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #31 in Hair Treatment Oils
#31 in Hair Treatment Oils:
Customer Reviews: 4.4 4.4 out of 5 stars 1,798 ratings
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Sep 17
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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Learn more about financing & leasing here.
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Top Amazon Reviews
Style: Full Size - 1 Fl Oz
I’m officially a lifelong customer of K18! This product has made my hair unbelievably shiny and silky—it’s truly incredible. I use the full K18 line, but this one stands out as the most effective while requiring only a tiny amount. Just three drops through my damp hair, and once it dries, there’s zero frizz and so much shine. It’s not cheap at $65, but absolutely worth every penny.
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Reviewed in the United States on July 18, 2025 by jessica b.
Style: Travel Size - 0.34 Fl Oz
Loooove! Smells good and works wonders. String so use it sparingly. A little goes a long way! I use it on towel dried hair after getting out of the shower before I apply any other products. Then I’ll go in with my leave in conditioner and brush through! I also use the leave in mask occasionally and I haven’t noticed a difference yet once adding the oil. Starting to use it more consistently now so fingers crossed!
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Reviewed in the United States on August 31, 2025 by Mego
Style: Travel Size - 0.34 Fl Oz
This is the best stuff ever! It is very expensive, but a little bag goes a long way, I have a thick, so, curly wavy frizzy hair, and this keeps my hair, sleek and smooth after each blowout
Reviewed in the United States on August 19, 2025 by Tina
Style: Full Size - 1 Fl Oz
Absolutely hands down the best product I have ever used on my hair. Leaves my hair healthy, shiny and frizz free without weighing down. I usually apply the tiniest amount after styling and it’s hair perfection
Reviewed in the United States on August 29, 2025 by Julie Stanchek Julie Stanchek
Style: Travel Size - 0.34 Fl Oz
K18 Molecular Repair Hair Oil is a luxe, peptide-powered treatment offering legit benefits—lighter, smoother, shinier hair with frizz control and heat defense. It’s especially worth it for damaged, bleached, or frizz-prone users. Just remember: less is more, and pairing it with the K18 mask amplifies results. It’s definitely pricy but would like to buy again..
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Reviewed in the United States on July 16, 2025 by Bini
Style: Travel Size - 0.34 Fl Oz
Outstanding product. Lightweight. Calms frizz. Nice smoothing results
Reviewed in the United States on July 30, 2025 by Peggy Kemeys
Style: Travel Size - 0.34 Fl Oz
I really wanted to like this product based on all the hype, but unfortunately, it did not work for me at all. I used it hoping it would improve the look and feel of my hair, but instead it left my ends dry, fluffy, and worse than before. It didn’t deliver on any of its promises. Maybe the other products in this line are better, but this particular one is a definite no for me. I won’t be repurchasing and wouldn’t recommend it to others with similar hair concerns. Save your money and look elsewhere.
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Reviewed in the United States on July 25, 2025 by Amber Jackson
Style: 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