K18 Biomimetic Hairscience leave-in molecular repair hair mask packaging on a white background

K18 Leave-In Molecular Hair Mask - Repairs Damaged Hair from Bleach, Color, Chemical & Heat

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K18 Biomimetic Hairscience leave-in molecular repair hair mask packaging on a white background

K18 Leave-In Molecular Hair Mask - Repairs Damaged Hair from Bleach, Color, Chemical & Heat

$69.99

K18 Leave-In Molecular Hair Mask - Repairs Damaged Hair from Bleach, Color, Chemical & Heat

$69.99

Reverse Years of Hair Damage in Just 4 Minutes

Bleach, color, heat, chemical services — every treatment your hair has ever endured leaves a mark. The K18 Leave-In Molecular Hair Mask is the breakthrough that changes everything. Powered by the patented K18PEPTIDE, this leave-in treatment works at the molecular level to reconnect broken keratin chains and restore your hair's natural strength, softness, and elasticity. It's not a conditioning mask that temporarily coats the strand — it's a true repair treatment that reverses damage from the inside out, delivering results that last wash after wash.

The Science Behind the Softness

K18 was developed after years of biomimetic research to create a peptide that perfectly mirrors the natural structure of hair's polypeptide chains. When applied to damaged hair, the K18PEPTIDE penetrates the cortex and relinks broken disulfide bonds — the same bonds that bleach, color, and chemical services sever. The result is hair that feels genuinely restored: softer, stronger, bouncier, and more manageable than it has been in years. Suitable for all hair types, including color-treated, bleached, relaxed, and heat-styled hair.

Leave It In, Let It Work

The application couldn't be simpler. After shampooing, apply a small amount to towel-dried hair, comb through, and do not rinse. Style as usual and let the K18PEPTIDE do its work. No waiting, no rinsing, no fuss — just visibly healthier hair from the very first use. With fast US shipping, your hair's comeback story starts the moment you order. Give your strands the molecular repair they deserve.

Returns Policy

You may return most new, unopened items within 30 days of delivery for a full refund. We'll also pay the return shipping costs if the return is a result of our error (you received an incorrect or defective item, etc.).

You should expect to receive your refund within four weeks of giving your package to the return shipper, however, in many cases you will receive a refund more quickly. This time period includes the transit time for us to receive your return from the shipper (5 to 10 business days), the time it takes us to process your return once we receive it (3 to 5 business days), and the time it takes your bank to process our refund request (5 to 10 business days).

If you need to return an item, simply login to your account, view the order using the "Complete Orders" link under the My Account menu and click the Return Item(s) button. We'll notify you via e-mail of your refund once we've received and processed the returned item.

Shipping

We can ship to virtually any address in the world. Note that there are restrictions on some products, and some products cannot be shipped to international destinations.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

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