one use of molecular repair hair oil delivers: clinically proven damage repair, 24-hr frizz control, 104% more shine, 78% reduction in split ends, and 450F heat protection

highly concentrated formula. start with 1-3 drops, build as needed.

silicone-free weightless oil is powered: K18PEPTIDE(TM), Avocado Oil, Sunflower Oil, Hemisqualane + Squalane.

how damage + frizz related? before + after of outer and inner layer

best seller

4.7

Rated 4.7 out of 5 stars

639 Reviews

K18 molecular repair hair oil

Weightless oil that strengthens, repairs damage + reduces frizz

Description

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.

clinically proven damage repair
24-HR frizz control
104% more shine
78% reduction in split ends
450°F (232°C) heat protection

more 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*

*Disclaimers

key benefits

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)

how to use

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.

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

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

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.

Pro Tip - If using the K18 molecular repair mask, apply the mask first on clean, damp hair, then wait 4 minutes. Apply the molecular repair hair oil, and wait 4 minutes for maximum strengthening results.

ingredients

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.

pairs well with

full-size leave-in molecular repair hair mask

4.7

Rated 4.7 out of 5 stars

7,869 Reviews

4-minute leave-in treatment to reverse hair damage

Description

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.

got questions?

Get started here.

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. The oil is for smoothing, styling and strengthening after the mask, and can be used on damp and dry 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, while natural oils work on the surface of hair without weighing it down.

Plus, you don’t need much of this highly concentrated formula to see results, just use 1-3 drops and build as needed. If you’re concerned about buildup, use our detox shampoo to remove 99% of product buildup after just 1 wash*.
*Disclaimers

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. Like layering different skincare products, the oil can be layered on top of the mask without impacting its performance.

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, in action

damage: hair before and after using molecular repair hair oil

dryness: hair before and after using molecular repair hair oil

split ends: hair before and after using molecular repair hair oil

damage

	clinically proven damage repair*
	24-HR frizz control*
	104% more shine*
	78% reduction in split ends*
	450°F (232°C) heat protection*

*Disclaimers
**after K18 routine + oil - K18 detox shampoo, molecular repair mask, oil on damp hair, blow dry, oil on dry hair

how to use it

PRO stylist + educator Carly Zanoni shows you how to apply the molecular repair hair oil.

PRO stylist + educator Eric Vaughn shows you how the K18 leave-in molecular repair hair mask + oil work together in your routine.

molecular repair

hair oil vs. mask

Do you use one over the other? Both? Glad you asked! Both are meant to be used at different parts of the routine but were created to work together for maximum impact

molecular repair oil

what it is: weightless, silicone-free hair oil

what it does: reverses damage that causes frizz long-term while immediately smoothing flyaways, adding shine, and reducing split ends

when to use: on damp or dry hair throughout styling

Please select a size

molecular repair mask

what it is: leave-in treatment

what it does: reverses hair damage in 4 minutes for lasting + progressive results

when to use: after shampoo, on damp, towel-dried hair before styling

Please select a size

the K18 difference

Feel what’s possible with fewer steps, less waste + less time.

patented K18PEPTIDE™ powers deeper + lasting repair.

how molecular repair compares

how K18 works

Traveling into the innermost layers of hair, our K18PEPTIDE™ renews strength along the width AND length of hair for lasting strength where it matters.

4.7

Rated 4.7 out of 5 stars

Based on 639 reviews

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639 reviews

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Megan R.
Verified Buyer
Reviewing
hair oil sample
I recommend this product
Rated 5 out of 5 stars
3 weeks ago
Soft and Shiny!
I recently bought the shampoo, conditioner and leave in treatment and this sample was included in the box. It made my hair so shiny that I decided to go back and buy a full size bottle. I love all my K-18 purchases so far. It has made my hair so soft and shiny.
Was this helpful?
K
K18Hair
3 weeks ago
Thank you Megan! We appreciate your 5-star review!
Amy G.
Verified Buyer
Reviewing
hair oil sample
I recommend this product
Rated 5 out of 5 stars
4 weeks ago
Magic for fine damaged hair
Worked very nicely to repair both my straight and curly styles. Used in conjunction with both the clarifying shampoo and repair mask. Will be buying the full sizes!
Was this helpful?
K
K18Hair
4 weeks ago
🤩 Thank you Amy!
Tania K.
Verified Buyer
Reviewing
Molecular Repair Hair Oil
I recommend this product
Age 35 - 44
Hair Concern Chemical damage
Hair Type Fine/Thin
My Results Stronger Hair, Soft Touchable Hair, Visible Difference
Rated 5 out of 5 stars
4 weeks ago
Magic
Is the best ever
Was this helpful?
K
K18Hair
4 weeks ago
Thank you Tania! We appreciate your review!
Keri C.
Verified Buyer
Reviewing
hair oil sample
I recommend this product
Rated 5 out of 5 stars
1 month ago
New
Before I received K18, my hair was braking at the touch. I have now used K18 for couple weeks and the change is amazing my hair is soft again coming back to life and I don't have to worry bout if I touch my hair it will brake off as it is not.
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K
K18Hair
1 month ago
Healthy hair feels amazing! Thank you for your review!
Brooklyn J.
Verified Buyer
Reviewing
mini molecular repair hair oil
I recommend this product
Age 25 - 34
Hair Concern Dryness, Frizz, Split-Ends, Fragile/brittle hair
Hair Type Medium Density, Curly/Coily
My Results Smoother Hair, Less Breakage, Visible Difference
Rated 5 out of 5 stars
1 month ago
The BEST oil
My hair is so dry, this oil has absolutely changed my hair!
Was this helpful?
K
K18Hair
1 month ago
Your review is the best! Your hair looks🔥!

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