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

I absolutely love this product! It’s incredibly lightweight and feels like I have nothing on my hair, yet it leaves everything smooth and polished. It helps tame frizz without weighing my hair down, and the scent is very mild, which I really appreciate. A little truly goes a long way (I have short hair though), so the bottle lasts much longer than expected. Perfect if you want smoothing and softness without any heaviness!

This is the most amazing hair oil and it drys. I have very straight, frizzy, dry hair , brittle and after one use my hair is so nice the dry frizzy, frizzy hair is gone. It looks great. I highly recommend this product.

I purchased this product to try the hair oil since I'm super picky about oils on my hair. I was looking for a replacement for the oil I've been using which hasn't been hydrating enough with the winter weather. Although the product amounts are super small, they are large enough for you to try and see if you like them for your hair. I already knew I loved the leave in hair mask but had never tried the lightweight repair oil. For reference, I have super thick, dark brown hair that falls at my waist. The oil is extremely lightweight but does a great job of hydrating my ends - which are long overdue for a trim. It helps me extend time between washes since my ends look hydrated without looking greasy. I would definitely give this a try if you don't want to commit to the large expense of the bigger bottles.

So far, 5 five stars. Good size bottle, remains to be seen how long it will last. I feel like this does smooth my crazy textured hair, and hopefully provides lasting results. The scent is wonderful, not too strong but clean and happy. So far, would highly recommend.

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.

My first 2 drops were yesterday as soon as I opened the package and I'm absolutely shocked with the results in my hair, I'm not exaggerating at all my ends look beautiful and healthy and overall my hair feels so soft I'm very obsessed with this brand

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.

I'm conflicted because the product seems to be doing something positive to my hair, but I can only see it when I straighten it/ blowdry it. If I were to use this & let my hair airdry naturally, I wouldn't be able to see a difference from before using the product. I don't think it has had a negative impact on my hair whatsoever, but for the price, content & how expensive the product is overall, I don't necessarily feel super inclined to re-purchase. HOWEVER ----- I have not used this product consistently every day 7 days a week. I use it usually on hair wash days, which is every 3 days. I had read somewhere it is best to use when hair is damp, so I don't apply it to my hair when it is dry. So I think my review might not be very fair. I can come back in a few months and review it / update. I do see a difference when I straighten it. It looks healthier at the ends (which is where I apply it) , and my ends don't look crunchy anymore. Not that they ever were, but they did look dry. I think in that sense (how dry my hair looked at the ends) it has done wonders. The only reason I am giving it 3 stars is -1 because I haven't seen results without heat in my hair, and -1 because of the price for a very small bottle. HOWEVER (again lol) it's lasted me like 2 months but that's only because I don't use it every day. Hope this review helps :)!!

Tengo decoloración en todo mi cabello, y este aceite no mancha mi rubio como otros aceites tipo moroccanoil.

En combinaison avec le k18 crème restructuration sublime les cheveux abîmés ou ternes. Les rends soyeux et brillants.

No difference

I have course, thick, dry Mediterranean hair. Putting this on my ends has really helped my hair feel a lot softer and healthier.

Very good and helpful