K18 Leave In Molecular Hair Repair Mask 50ml

Experience a breakthrough in hair repair with the K18 Leave In Molecular Hair Repair Mask. This leave-in treatment uses patented K18Peptide™ technology to reset damaged hair at the molecular level, delivering strength, softness, and lasting shine for all hair types. Perfect for dryness, brittleness, and breakage, this compact 50ml formula fits seamlessly into any routine. The K18 Leave In Hair Mask is essential for anyone looking to enhance their hair health.

Key Benefits and Features
  • Hydration: Deeply nourishes dry, brittle hair with a weightless moisture boost that won’t weigh strands down. This hydrating hair repair mask is perfect for restoring moisture balance.
  • Repair: Rebuilds damaged keratin bonds using K18Peptide™ technology for stronger, more resilient hair. The molecular hair repair treatment effectively targets the root causes of hair damage.
  • Smoothness & Manageability: Improves detangling and reduces frizz for silkier, easier styling. This leave-in conditioner for damaged hair enhances overall hair manageability.
  • All Hair Types & Color Safe: Suitable for straight, wavy, curly, and coily hair, including color-treated options. The K18 Leave In Molecular Hair Repair Mask is safe for all hair types.
  • Fast-Absorbing, Leave-In: Absorbs quickly without rinsing, leaving a lightweight, non-greasy finish. This non-greasy hair treatment is ideal for daily use.
Who It’s For

This mask is ideal for anyone seeking to repair dryness, brittleness, or breakage across all hair types. It’s particularly beneficial for damaged, chemically treated, or heat-styled hair, as well as those who want a lightweight, non-weighting treatment. For fine hair, use a small amount to avoid buildup; for thick or coarse hair, you can apply a touch more to ensure full coverage. The K18 Leave In Hair Mask is a versatile solution for various hair concerns.

Key Ingredients
  • K18Peptide™: Patented molecular repair technology that re-knits keratin bonds, restoring hair strength, elasticity, and bounce. This key ingredient is what makes the K18 Leave In Molecular Hair Repair Mask so effective.
  • Lightweight Conditioning Matrix: A clean, non-greasy base that smooths the cuticle and enhances manageability without weighing hair down. This lightweight formula is perfect for daily use.
  • Humectant Blend: Helps lock in moisture to counteract dryness and brittleness, keeping hair soft and supple. The hydrating properties of this mask make it an essential part of your hair care routine.
How to Use
  • After cleansing, gently towel-dry hair to remove excess water.
  • Dispense a small amount onto your palms and distribute evenly through mid-lengths to ends. Avoid applying directly to the scalp for thick or very fine hair, as needed.
  • Do not rinse. Style as usual and air-dry or use heat tools as desired. For best results, pair with the K18 system (shampoo and conditioner) to maximize molecular repair across the hair fiber.

Incorporating the K18 Leave In Molecular Hair Repair Mask into your hair care routine can significantly improve the health and appearance of your hair. This product is a must-have for anyone looking to achieve soft, shiny, and manageable hair.

Specifications

Brand
K18
Size
50ml
Hair concerns
Damaged, Breakage, Weak Hair, Bleached, Chemically Treated

Authorised K18 stockist

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Why our stylists rate it
From the Partners Hair team
K18 Leave-In Molecular Repair Mask is the original 4-minute leave-in treatment that repairs hair at the molecular level. K18Peptide — K18's patented bioactive peptide — reconnects broken keratin chains inside the hair fibre caused by bleach, colour, chemical treatments, and heat. Applied once and not rinsed out, it works from the inside out for visibly stronger, smoother, healthier hair.

Best for: all hair types with chemical, heat, or mechanical damage — bleached, coloured, over-processed, or heat-damaged hair.
Less suited to: a conditioning rinse-out treatment; a styling product.

Key actives:
- K18Peptide (patented bioactive peptide) — reconnects broken keratin chains; repairs from the inside out in 4 minutes

Benefits:
- Molecular repair from bleach, colour, and heat damage
- Stronger, smoother, more elastic hair
- Leave-in; no rinse; 4 minutes; colour-safe; all hair types

How to use: After washing and conditioning, apply a small amount to damp hair. Do not rinse. Style as usual.

Format: 50ml K18 Leave-In Molecular Repair Mask.

Authorised K18 stockist — 100% authentic, sourced from the official South African distributor. Free delivery on orders over R390 across South Africa.
Delivery without the guesswork

Spend R390 and delivery is on us. Orders under R390 are delivered for R67. We normally pack within 1 working day, with delivery in 2–5 working days depending on your location.

Changed your mind? You have 7 days after receiving your order to request a return. Email hello@partnershair.co.za to get started.

Why shop it at Partners Hair

Professional haircare is only as good as the source. We buy through official South African distribution, so every item is genuine, authorised stock.

Behind the store are 250+ working stylists across 24 Cape Town salons. Need help choosing? Visit Ask the Experts for real advice from the salon floor.

Why professionals trust Partners

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Advice from 250+ working stylists

The products online are the products our teams reach for in 24 salons every day.

Only authentic professional stock

Authorised products sourced through official South African distribution.

Customer Reviews

Overall rating: 4.6 / 5 from 68 reviews.

Customer photo review of K18 Leave In Molecular Hair Repair Mask - 50ml Hair Treatment

I am a type 3 curly-haired girl, and after a big chop, I was looking to bring more life back into my hair. Read about K18, and I am impressed with the results; my hair is much healthier and softer. The curls are curling. Very happy with the product and would recommend it to ladies struggling with severe heat damage or just damage in general.

K18 Leave In Molecular Hair Repair Mask - 50ml Hair Treatment

Customer video review of K18 Leave In Molecular Hair Repair Mask - 50ml Hair Treatment

I was sceptical when I first purchased k18, but after the first wash I could feel an immediate difference. I washed my hair twice, towel dried and applied k18 for 4min. Afterwards I applied a hair mask and rinsed it off. My hair feels so strong and smooth.

K18 Leave In Molecular Hair Repair Mask - 50ml Hair Treatment

Customer photo review of K18 Leave In Molecular Hair Repair Mask 50ml

K18 is a holy grail when it comes to hair repair. From the very first use the breakage reduced considerably and the shine was restored. I enjoyed stopping on your website. Delivery was so quick and easy. I will definitely order from you again :)

K18 Leave In Molecular Hair Repair Mask 50ml

Customer photo review of K18 Leave In Molecular Hair Repair Mask 50ml

Just after 2 days my order arrived at my door 😁 I follwed the instructions very carefully and did my research before pirchasing to make sure I used the product correctly to get effective results. I must say even after just using it for the very first time I could feel and see the difference. My hair is so soft, healthy and shinny.... This is my new Go Too essential for Healthy Hair

K18 Leave In Molecular Hair Repair Mask 50ml

Customer photo review of K18 Leave In Molecular Hair Repair Mask 50ml

Long, blond, curly hair is very difficult for me to manage. Every time I highlight it, I know I’m weakening my hair, and it breaks so easily. I’ve been using the K18 product, and I must say, after using it three times, my hair feels incredible!

K18 Leave In Molecular Hair Repair Mask 50ml

Delivery was seamless and great. The product itself is probably not formulated for my type of hair (4C). It left white residue as it dried even though its instructions are to not wash it off. In terms of helping with strengthening the hair strands, I'm still waiting to see.

K18 Leave In Molecular Hair Repair Mask - 50ml Hair Treatment

My hair was really dry and broken. Thought the only way is to cut all off. Then I remembered an add about K18 and used it previously about 2 years ago. Hair getting better and no cutting needed. An amazing product .

K18 Leave In Molecular Hair Repair Mask - 50ml Hair Treatment

I immediately noticed a difference in my hair texture after my first use. It’s a leave in treatment that doesn’t leave any type of residue, my hair absorbs it really well. I will definitely repurchase this treatment

K18 Leave In Molecular Hair Repair Mask - 50ml Hair Treatment

Works exceptionally on chemically processed hair. I did not bleach, but had a ton of damage from too much dyeing to cover stubborn greys. I would absolutely recommend this for an injection of life into otherwise dead hair in the grips of breakage. Life-changing product.

K18 Leave In Molecular Hair Repair Mask 50ml

Not a bad product but not as amazing as the reviews say. My hair still feels crispy when I wake up in the mornings.

K18 Leave In Molecular Repair Mask 50ml

This was my first time purchasing this product after reading numerous reviews and I can vouch for it. I see a drastic improvement after about 6/7 washes. Hair looks much healthier after damage from highlights.

K18 Leave In Molecular Repair Mask 50ml

Great product! I'll buy it again. My hair was severely damaged, bleached damage. And I'm extremely happy with the results I've only used it twice and the results are amazing!

K18 Leave In Molecular Repair Mask 50ml

Very dissapointed! This product does not work. This is very dissapointing as it is rated best on the market and is extremely expensive.Makes my hair hard and frizzy.

K18 Leave In Molecular Repair Mask 50ml

One of the best products I’ve used on my naturally wavy and frizzy hair which is also highlighted, it smooths it out and adds lots of shine. My hair looks healthy and strong with just one use. One of my favorite products! It is a little pricey but it’s worth it!

K18 Leave In Molecular Repair Mask 50ml