Molecular Repair Hair Oil

Molecular Repair Hair Oil is rated 4.6 out of 5 by 177.
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What It Is

This biotech-engineered weightless oil works on all hair types to strengthen, repair damage, reduce frizz at two levels of the hair fiber, and improve shine.

What It Does

This silicone-free oil fights frizz differently by addressing the damage that causes frizz long-term and immediately smoothing frizz + flyaways.

• 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

• Delivers heat protection: to prevent further frizz

• causing damage up to 450°F (232°C)

What Else You Need to Know

Strengthening, smoothing hair oil works on two levels of the hair fiber to fight frizz.

The K18PEPTIDE™ works to address deeper-level damage that causes frizz —repairing and strengthening damage at the innermost layer of hair to reverse damage that leads to frizz.

On the surface of hair, natural oils like avocado and sunflower oil, and hemisqualane and squalane nourish while smoothing frizz + flyaways to improve color vibrancy, enhance shine, and provide 450°F (232°C) heat protection.

 

• Clinically proven to repair damaged hair*

• 24-HR frizz control**

• 104% increase in shine***

• 78% reduction in split ends****

• 450°F (232°C) heat protection*****

 

*Results observed on bleached hair tress after one application of molecular repair hair oil

** Results observed on curly, frizzy hair after 24 hours in 80% relative humidity, with one application of molecular repair hair oil on dry or damp hair

***Results observed after one application of molecular repair hair oil on dry hair

****Results observed on bleached/damaged hair after one application of molecular repair hair oil on dry hair

*****Results observed after one application of molecular repair hair oil and application of 450 degree flat iron on dry hair

1. Apply to damp, towel-dried hair before styling, or on dry hair as a finisher. Highly concentrated formula. Start with 1-3 drops and build as needed.

2. Use on damp hair for: strengthening benefits and to reduce frizz during air-dry or styling.

3. Use on dry hair to: smooth frizz and flyaways, as a finisher to add shine

 

For Stylist Use

Begin with PRO molecular repair hair mist:

1. Mist dry hair with water (do not saturate).

2. Section hair into 4 quadrants.

3. For 300ml PRO mist, apply 4-9 sprays per quadrant. For 150ml PRO mist, apply 6-12 sprays per quadrant based on hair length and density. Hair should feel slightly damp.

4. Let sit for 4 minutes (do not rinse out).

5. Dry hair if needed, then perform color or lightening service and process as usual.

 

Apply the PRO molecular repair hair mask:

1.Shampoo (do not condition) and towel dry thoroughly.

2.Apply 1-3 pumps of K18 PRO mask, depending on length, thickness, and condition. Work evenly into hair from ends to roots, one pump at a time.

3.Let sit for 4 minutes (do not rinse out).

 

Finish with the molecular repair hair oil

1. Apply 1-3 drops of Molecular Repair Hair Oil to damp hair, starting at the ends and working upward through the mid-lengths.

2. Wait 4 minutes. Style as usual.

3. Apply an additional 1-3 drops of Molecular Repair Hair Oil to dry hair as a finisher.

 

For Client Use

Highly concentrated formula. Start with 1-3 drops and build as needed.

• Apply to damp hair from mid-lengths to ends. For strengthening benefits from the K18PEPTIDE™ wait 4 minutes before styling.

• Apply to dry hair as a finisher.

Caprylyl Caprylate/Caprate, Squalane, Persea Gratissima (Avocado) Oil, Helianthus Annuus (Sunflower) Oil, C13-15 Alkane, Undecane, Benzyl Alcohol, Tridecane, Castor Isostearate Succinate, Propanediol, sh-Oligopeptide-78, Fragrance (Parfum), Tocopherol, Cinnamal, Hexyl Cinnamal, Limonene, Linalool.

Purchases made in SalonCentric stores may be returned to any SalonCentric store. Purchases made through SalonCentric Customer Service, SalonCentric Business Partners, and SalonCentric.com orders Sold and Shipped by SalonCentric may be returned to a SalonCentric store; however, the return must not exceed $450 and must include the original receipt, packing slip, or invoice. For returns in-store of online orders, the refund will be credited back to the original payment method once the return has been processed. For SalonCentric.com Online Exclusive orders sold and shipped by third-party sellers, please see more details linked below for return steps.

The SalonCentric return policy does not currently apply to Kérastase & Shu Uemura purchases. Kérastase & Shu Uemura do not accept returns.

Click to see more details.

Rated 3 out of 5 by from Not enough for very dry hair This is good as a finishing product to add some shine, but if you’re looking to truly add nourishment, this isn’t it.
Date published: 2025-11-04
Rated 5 out of 5 by from frizz and dry ends my hair hasn’t felt so smooth and looked so sleek in ages. i’m already obsessed
Date published: 2025-09-30
Rated 5 out of 5 by from LOVEEEE i love this oil, little goes a long way. made my hair feel so smooth and shiny
Date published: 2025-09-26
Rated 5 out of 5 by from Amazing shine I love this oil. My hair is super curly. This oil helps reduce frizz and gives me a shine for 3 to 5 days.
Date published: 2025-09-22
Rated 5 out of 5 by from I love this product! It leaves my hair feeling soft and looking renewed! Just 2 drops throughout the ends revitalize my hair!
Date published: 2025-08-23
Rated 5 out of 5 by from magic in a bottle I love to use this at the end of the day, come home from work brush out my hair and apply leaves my hair feeling brand new the next morning. The consistency scared me first as it appears it could leave the hair feeling greasy but I have not found an issue with the method I’ve chose to use it. I have medium to fine texture hair and can say my hair strand felt healthier and thicker/stronger in even just the first use!
Date published: 2025-08-05
Rated 5 out of 5 by from hair gold The best product for all hair types!!! Great on dry hair as it doesn’t feel weighed down but also great after washing to help nourish and heal damaged hair!
Date published: 2025-07-28
Rated 5 out of 5 by from Nothing like it So lightweight that it doesn’t weigh down hair or look oily, but it still smooths fly aways giving a fresh sleek look
Date published: 2025-07-23
Rated 5 out of 5 by from Sooooo good. Smells awesome and works as advertised! I use this on every client after blowdrying.
Date published: 2025-06-30
Rated 5 out of 5 by from 10/10 This oil has been a holygrail for my clients and for myself in maintaining my hair and my clients hair healthy and for it to continue growing healthy and long
Date published: 2025-06-12
Rated 5 out of 5 by from best product for rebuild Absolutely trust this product and will continue using it
Date published: 2025-05-03
Rated 5 out of 5 by from The absolute BEST HAIR OIL!!!!!!! My hair soaks it up so nicely without feeling heavy or transferring oil onto my clothing. It leaves a gorgeous gloss and is weightless. Will purchase time and time again 🥳
Date published: 2025-04-25
Rated 5 out of 5 by from This oil makes you hair so soft!! I did use a little too much it made my hair look a little greasy. You just need a small amount.
Date published: 2025-04-09
Rated 4 out of 5 by from Molecular Repair Hair Oil This repair hair oil works good but it's nothing special or better then other repair oils, specially for the cost.
Date published: 2025-04-02
Rated 5 out of 5 by from silky smooth Just a dab will do…I love the shine and silky smooth results I can achieve with this product after a service.
Date published: 2025-03-30
Rated 5 out of 5 by from Great! Love this! You really only need 2-3 drops. Makes the hair smooth and shiny.
Date published: 2025-03-19
Rated 5 out of 5 by from Smoothing Great results It is a great way to seal the cuticle after a chemical service.But you can easily use to much, a little goes a long way.
Date published: 2025-03-16
Rated 4 out of 5 by from Would get again Smells great and love it for thick and frizzy hair. I love to use it before and after blowouts especially after a color service.
Date published: 2025-03-13
Rated 5 out of 5 by from Best product LOVE this stuff. I like to oil the ends of my hair each night and this has helped keep my hair super healthy and no split ends
Date published: 2025-03-07
Rated 5 out of 5 by from A little goes a long way Worked well but need to be careful not to apply too close to the roots otherwise it started to weigh down hair and become too flat
Date published: 2025-03-06
Rated 5 out of 5 by from Best oil I can’t get enough of this oil. I can use it on all hair types for amazing hydration, shine, and repair without it weighing down the hair. My fine hair clients were so hesitant to let me use it of them but now that all request it!!
Date published: 2025-02-23
Rated 5 out of 5 by from Amazing! I love this product so much. My hair feels amazing after using it!
Date published: 2025-02-17
Rated 5 out of 5 by from New favorite! This is a GREAT hair oil. You do not need a lot, in fact just 1-2 drops works perfect for me. (I have hip length, thick but fine, straight hair). This oil provides such a beautiful shine to the hair while adding hydration.
Date published: 2025-02-01
Rated 5 out of 5 by from The bottle is secured nice and light I was looking for something for the client who has thin hair.
Date published: 2025-01-18
Rated 5 out of 5 by from I even carry one in my purse! I keep this on my shelf all the time especially for my costumers to take home. I recommend to use before styling and after if needed. The hair is soft and shinny. Love the product!
Date published: 2025-01-01
Rated 4 out of 5 by from good but expensive It’s a great oil but for the price point there are other oils I prefer
Date published: 2024-12-17
Rated 5 out of 5 by from K 18 Hair oil I bought this for my Daughter and she loves it for her curly Hair
Date published: 2024-12-13
Rated 5 out of 5 by from perfect oil I love the K18 oil. It’s clear, which is perfect for blondes & it feels lightweight. It also has heat protectant, which is a plus! It doesn’t make the hair feel too oily or greasy. Always makes my hair feel stronger. Especially when I’m using it once a day, every day.
Date published: 2024-12-10
Rated 5 out of 5 by from this product is amazing!! absolutely love this serum and the entire k18 line for myself, and for my clients!
Date published: 2024-12-02
Rated 5 out of 5 by from Great I absolutely love it! I use it mostly everytime after the shower! It leaves my hair so soft and shiny
Date published: 2024-11-10
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