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I don’t ask for much in myhair products.

A diptych of Allure contributor Michelle Rostamian before using K18 LeaveIn Hair Mask and after using it for five washes…

Courtesy of Michelle Rostamian forAllure

If it makes my hairsmell good, that’s an added bonus.

OK, maybe Idohave high expectations, but can you blame me?

But, every so often a product will hit my inbox that I’mreallyintrigued by.

An open white tube of K18 LeaveIn Molecular Repair Hair Mask on an offwhite background

Courtesy of brand

One such product is theK18 Leave-In Molecular Repair Hair Mask.

Spoiler alert: it is but with a few notable caveats you should be aware of.

First, a word on how the product is different from otherbond-building productson the market.

A diptych of Allure contributor Michelle Rostamian showing a backside view of her thick black hair before and after…

The author’s hair before and after applying the treatment.

But alas, I gave it a go anyway.

Here’s how I incorporate K18 into my routine: in the shower, I use theOlaplexNo.

4C Bond Maintenance Clarifying Shampoo and skip the conditioner.

A bottle of Olaplex No.4C Bond Maintenance Shampoo on white background

(*Note: It’sreallyimportant to use aclarifying shampooandnotfollow up with a conditioner.

The author’s hair before and after applying the treatment.

In fact, the first time I used K18, I was not impressed.

A reflective multicolored bottle of Daily Dose Miracle Moisture Leave-In Conditioner on white background

However, according to Los Angeles-based hairstylistMatthew Collins(who is unaffiliated with K18), this is normal.

But the real “wow” factor for me came after I had my hair professionallyblown out.

My hair was bouncier, shinier, and silkier than ever before.

Philip B. Rejuvenating Oil on white background

But, I’m happy I stuck it out because my hairreally doeslook and feel different.

For Collins, he noticed less breakage andbouncier curlsafter a few uses.

All in all, I can see why beauty buffs across the board are fans of this product.

A selfie of Allure contributor Michelle Rostamian with silky wavy black hair — taken after using the K18 leavein mask…

Courtesy of Michelle Rostamian forAllure

For non-professionals like me, it restores softness and shine, and overall makes my hair more manageable.

K18

K18 Leave-In Molecular Repair Hair Mask

Want to try it out for yourself?

K18’s Leave-In Molecule Repair Hair Mask is available atsephora.comfor $75.

K18 Leave-In Molecular Repair Hair Mask on white background