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K18 Molecular Repair Mask 50ml

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A leave-in hair treatment to reverse chemical and physical damage to hair. 

*Paraben Free

*Cruelty Free

* Vegan

* Sulphate Free

We tend to put our hair through a lot, which is where the K18 Leave-In Molecular Repair Mask comes into play. This no-rinse hair treatment, made with a patented bioactive peptide, promises to reverse damage caused by colouring, heat and styling. Think of it as an apology note to your frazzled, stressed-out hair -  one that works by repairing the keratin within each strand. 
You can expect stronger, softer and more manageable hair as that damage is repaired. If your hair is porous, crunchy, over-processed and generally past its best, you’ll want to know about this mask. 

Why will I love the K18 Leave-In Molecular Repair Mask?

  • Damage-reversing treatment for compromised hair 
  • Works in 4 minutes 
  • Treats damage from styling, colouring and lightening 
  • Patented bioactive peptides 
  • Repairs keratin within the hair 
  • Do not rinse out 
  • Softens, smooths and detangles
  • 50ml

Who is the K18 Leave-In Molecular Repair Mask best for?

If your hair is damaged, dry and generally past its best, this hair mask has your name on it. The only thing that really changes is how much you should use: start with less if you have fine hair, and work your way up depending on how long, thick and damaged your hair is. 

How should I use the K18 Leave-In Molecular Repair Mask?

In short, not like a normal hair treatment. This mask has been formulated to work without being rinsed out. First, wash your hair as normal, then towel dry gently but thoroughly. Then, dispense one pump of the K18 treatment into your hand and work through your hair evenly from root to tip. If you have short, fine hair, this may well be more than enough, but longer, thicker hair will need more. Work one pump at a time to avoid overloading your hair, and make sure you’re applying evenly. 
Let the treatment sit for four minutes then continue directly to your styling products - do not rinse. 

What else do I need to know about the K18 Leave-In Molecular Repair Mask?

  • When you first get this treatment, you’ll want to use it four washes in a row, but after that, every four to six washes is the way to go. 
  • If you’re a regular dry shampoo user, or otherwise likely to have a bit of product buildup in your hair, it’s best to use a clarifying shampoo or scalp scrub before going in with this treatment. 
  • It’s important not to condition your hair before using this mask, and also not to use too much and overload your hair. 
  • This treatment is also available in a small 5ml size, ideal for travel or trying it out. This listing is for the full 50ml size. 


Water (Aqua) (Eau), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78, Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.

Write a Review

    Posted by Charli on 25th Aug 2021

    This product is my absolute go to forget olaplex k18 is where it is at

  • Unbelievable

    Posted by Jane on 14th Jul 2021

    The best repair mask i have ever used

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.


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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