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K18

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4.5

Molecular Repair Hair Oil

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.

Reverses damage caused by frizz
Smooths frizz and flyaways
Enhances shine and color vibrancy

This 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 the hair fiber to reverse damage that leads to frizz.

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

Clinical Results:
In a 3rd party clinical study, one use of the K18 Molecular Repair Hair Oil delivered:

- 24-hour frizz control*
- 104% improvement in shine**
- 78% reduction in split ends***

*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 a single 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

- K18PEPTIDE™ reverses hair damage that causes frizz, promotes strength and smoothness. Hemisqualane and Squalane reinforce hair's moisture barrier, smooth flyaways, enhance shine.
- Avocado Oil provides heat protection up to 450°F (232°C).
- This product is vegan and cruelty-free.
- Fragrance Description: Fresh floral scent

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K18

Molecular Repair Hair Oil

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K18 = Sephora

K18 Biomimetic Hairscience

Get hair like new* with K18's biology-first haircare, designed to make the impossible possible.

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Reviews

4.5

1,091 Reviews

5

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3

2

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Recent Reviews

ashleyciona

5

6/24/2025

After getting my virgin hair dyed for the first time, I was looking for something to keep it healthy and frizz-free. I love how little of this oil you have to use, and it does not sit heavy on the hair at all. makes ponytails so much

Recommended

Originally posted on sephora.com

noonelikesme

Verified Buyer

4

6/21/2025

Lovely scent, lightweight and effective

I like the scent and how light weight the product feels when used sparingly I give it a one-star deduction tho because it’s literally impossible to get three small drops of the product dispenser out of the bottle so I poured some product into the trail size bottle I received from my stylist that trail size bottle actually has a real dropper top and I can get the product out of it more sparingly

Recommended

Originally posted on sephora.com

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