Search  for anything...
K18

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

  • Based on 2,974 reviews
Condition: New
Checking for the best price...
$65.00 Why this price?

Buy Now, Pay Later

As low as $10.83 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

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.
Fulfilled by Amazon
Arrives Tuesday, Aug 11
Order within 12 hours and 21 minutes
Available payment plans shown during checkout
Protection Plan Protect Your Purchase
Checking for protection plans...

Recently Viewed

Size: Full Size - 1 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.

Description

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. Molecular Repair Oil Molecular Repair Mask Damage Shield Conditioner Detox Shampoo Damage Shield Shampoo AirWash Dry Shampoo AstroLift Volume Spray

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: #2,950 in Beauty & Personal Care (See Top 100 in Beauty & Personal Care) #24 in Hair Treatment Oils


#24 in Hair Treatment Oils:


Customer Reviews: 4.3 4.3 out of 5 stars (2,974)


Product Benefits: Our K18PEPTIDE™ repairs hair at a molecular level across multiple types of bonds, restoring hair health for all


Hair Type: Curly, Fine, Straight, chemically-treated-hair, textured-hair


Scent Name: Unscented


Item Form: Oil


Liquid Volume: 1 fluid ounces


Number of Items: 1


Unit Count: 1 Fluid Ounces


Item Volume: 30 ml


Brand Name: K18


Manufacturer: K18 Hair


UPC: 858511001500


Global Trade Identification Number: 00


Item Weight: 2.4 ounces


Material Type Free: Silicone Free


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Tuesday, Aug 11

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.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Great to recover over processed hair
Size: Travel Size - 0.34 Fl Oz
I love this K18 products, very reconstructive, a little expensive but is a great product for over processed hair, you see the results in a few days, I highly recommend it for blondes 🫶
Reviewed in the United States on July 22, 2026 by Daydi Toledo Castro
    • Effective!
Size: Full Size - 1 Fl Oz
This oil is not greasy but leaves me hair looking healthier with it no longer looking like straw! I've used this for a few years and certainly plan to stick with it!
Reviewed in the United States on July 25, 2026 by Shellical Angelical
    • Amazing helper my hair approved and me too.
Size: Full Size - 1 Fl Oz
Item feels weird on my hands. Feels like water not oil. However on my hair just after shower i am so happy my hair is healthy looking feels great and the blond is not so breakable. Will ve buying again. I add this product after shower/ less product if after drying. I have full blonde hair and its great. ... show more
Reviewed in the United States on July 15, 2026 by Rafael Lopez
    • Worth every single penny!
Size: Travel Size - 0.34 Fl Oz
Nothing compares! The combination of the K-18 hair oil and bonding complex has completely transformed my damaged hair! I’m only on week 2 and my hair looks and feels like I just stepped out of the salon! I can see it actually repairing all of the damage I have done to my poor hair over the years. Will be using this forever and ever! ... show more
Reviewed in the United States on July 28, 2026 by Amazon Customer
    • Love your hair
Size: Travel Size - 0.34 Fl Oz
Review Image by Carrie Gregory
One of the best products for my hair. Harsh bleaching from highlights is hard on my hair but this product is a life saver! Hair is softer and light weight.
Reviewed in the United States on July 18, 2026 by Carrie Gregory
    • Leaves your split ends moist and soft
Size: Travel Size - 0.34 Fl Oz
This is amazing, very expensive but worth every penny
Reviewed in the United States on June 21, 2026 by katherine
    • Tiny bottle
Size: Travel Size - 0.34 Fl Oz
So i gave it a 4 becuz its the tiniest bottle ive ever seen LOL. But apparently it’s works well to grow the hair.
Reviewed in the United States on July 1, 2026 by Bria
    • Good Hair Oil, But Not Amazing for the Price
Size: Travel Size - 0.34 Fl Oz
This hair oil is lightweight and doesn't leave my hair feeling greasy, which I really liked. It adds a bit of shine and helps reduce some frizz, but I didn't notice the dramatic repair or strengthening that I was expecting. Considering the price, I expected more noticeable results. It's a decent product, but I'm not sure I would purchase it again unless it was on sale. ... show more
Reviewed in the United States on July 22, 2026 by Ana lilian Escobar Rey

Can't find a product?

Find it on Amazon first, then paste the link below.
Checking for best price...