K18 Leave-In Repair Hair Mask, 50ml

£52.95

Experience the transformative power of the K18 Leave-In Repair Hair Mask, 50ml. This innovative, leave-in treatment is formulated to help restore hair strength, softness, and bounce in just four minutes. Ideal for those seeking to manage the appearance of damage caused by bleach, colour, chemical services, and heat styling, this mask works to leave your hair feeling revitalised. Whether you are dealing with dryness or the effects of regular styling, this concentrated formula provides a simple, effective addition to your routine. Discover why this 50ml bottle is a staple for maintaining healthy-looking hair at home.

22 in stock

K18 Leave In 50ml: About K18 Leave-In Repair Hair Mask 🧬

The K18 Leave-In Repair Hair Mask, 50ml is an advanced hair care solution designed for those looking to improve the condition of their hair. Using patented peptide technology, this leave-in treatment aims to help restore the appearance of strength, softness, and smoothness.

It is specifically formulated to address the visible effects of bleach, colour, chemical services, and heat styling, making it a versatile choice for various hair types.

Unlike traditional conditioners that may only coat the surface, this treatment is designed to work within the hair fibre. It is a popular choice for anyone seeking a simple, time-efficient way to support their hair’s natural bounce and vitality.

Product Facts

This 50ml bottle contains a concentrated formula that is vegan, cruelty-free, and colour-safe. Because it is a leave-in product, it does not wash away with your next shampoo, allowing for lasting results when used consistently. To achieve the best experience, we recommend using it every four to six shampoos.

Size: 50ml
Technology: Patented K18Peptide™
Suitability: All hair types
Ethics: Vegan and cruelty-free

Benefits of Using This Treatment ✨

Regular use of the k18 leave in 50ml mask helps to minimise the appearance of damage. By supporting the hair’s structural integrity, it helps to improve manageability and shine. Users often notice that their hair feels softer and looks more resilient after just a few applications. It is an excellent option for those who frequently use hot tools or undergo chemical treatments.

Who It Is For

This mask is suitable for anyone concerned with dry, brittle, or processed hair. Whether you have fine, thick, straight, or curly hair, the lightweight formula is designed to integrate into your existing routine without weighing your hair down. It is particularly beneficial for those who have recently had their hair bleached or coloured, as it helps to maintain a healthy-looking finish.

How to Use

For optimal results, follow these simple steps:

Shampoo your hair thoroughly, but do not use a conditioner.
Towel dry your hair until it is damp.
Apply one pump of the K18 mask, adding more as needed based on your hair’s length and thickness.
Work the product evenly from ends to roots.
Wait exactly four minutes for the formula to activate.
Do not rinse out. Style your hair as you normally would.

Note: If you are a heavy user of dry shampoo or styling products, we recommend using a clarifying shampoo first to ensure the peptide can penetrate effectively. Always perform a patch test if you have sensitive skin.

Pair With

To maintain your hair care routine, you may wish to explore our wider range of browse the related category essentials. For daily styling, the view this related product is a great companion for added moisture, while the view this related product can help manage frizz. For those who enjoy a luxurious finish, the view this related product provides a beautiful, polished look.

FAQ

Frequently Asked Questions

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

For the best results, use the mask for the first four to six consecutive washes. After that, you can use it as needed for maintenance, typically every three to four washes.

Can I use other styling products with this mask?

Yes, but please wait the full four minutes for the K18 mask to activate before applying any other styling products, such as heat protectants or oils.

Should I use a conditioner before applying K18?

No, it is important to skip conditioner before using this mask. Conditioner can create a barrier that prevents the K18Peptide™ from penetrating the hair shaft effectively.

Is this product suitable for all hair types?

Yes, the K18 Leave-In Repair Hair Mask is designed to be effective on all hair types, including fine, thick, curly, and chemically treated hair.

Expert Reviewed: This guide was reviewed by the BC GELS Professional Beauty Team. Updated on August 1, 2026.

Brand

K18 Hair

Is the K18 hair treatment right for my hair? Whether your hair is fine or coarse, if it’s damaged, over-coloured and processed or just outright compromised, this treatment has your name on it. The thing to remember here is that this is a mask you don’t rinse out: if you think that’s likely to be too heavy for your hair, you’ll want to get the smaller size first and try it out. How should I use the K18 leave in mask? When it comes to this little miracle worker, you need to throw out your usual ideas about how to use a hair treatment. Here’s the correct order of operations: First, wash your hair. Then, towel it dry. You want it to be damp rather than dripping wet. Now, it’s time to apply your K18 leave in mask. Start with one pump, and work it through your hair from root to tip. If you have short or fine hair, that will be enough. It may even be too much. But if you have long, thick, very damaged hair, you’ll want another pump or two. Wait four minutes. Do not rinse. Now’s the time to apply any other products you usually get involved with. Style your hair however you’d like. How does the K18 hair treatment work? It repairs the keratin bonds in your hair. They may have been damaged by colouring, heat, or by physical styling (likely a combo of the three) but regardless, the K18 hair mask will repair those bonds. K18 is made with a patented peptide which helps to repair the links between keratin cells, and because you don’t rinse it out, that effect continues after you’ve applied. We’re talking real, visible change, friends.