K18 Leave-In Molecular Repair Mask 50ml

(32 customer reviews)

NZD $135.90

or 6 weekly interest-free payments from NZD $22.65 with Laybuy what's this?


4-minute leave-in treatment to reverse damage.
Hair like new. This leave-in mask heals and strengthens hair with lightweight moisturizing benefits to detangle and keep hair smooth and soft, without weighing it down. Please see dosage chart for exact usage. For best results, use for the first 4-6 consecutive washes following a service, and then every 3-4 washes as needed to maintain hair strength.



  1. Shampoo, do not condition. Towel dry thoroughly.
  2. Begin with 1 pump of K18 Mask and add more as needed depending on the length, thickness, and condition. Work evenly into hair, one pump at a time, from ends to roots.
  3. Let sit for 4 minutes to activate.
  4. Do NOT rinse out. Style as usual.

Best for: All hair types.

32 reviews for K18 Leave-In Molecular Repair Mask 50ml

Based on 32 reviews
5 star
4 star
3 star
2 star
1 star
  1. Jo Knight (verified owner)

    (0) (1)
  2. Shannon Lee (verified owner)

    Amazing product, I am so glad I purchased this, it’s saved my hair and I’ve already seen a huge improvement! And it makes it feel amazing so that’s a bonus!

    (0) (0)
  3. Kelly (verified owner)

    So easy to use (great for a busy mum!) and noticeably different hair after first treatment. Would definitely recommend

    (0) (0)
  4. Karla H. (verified owner)

    In love with this product! My hair feels amazing. Awesome service and fast postage too, thank you so much 🤩

    (0) (0)
  5. Raye (verified owner)

    Recommended to me by a fellow frizzie haired friend. Have spent thousands on salon treatments & straightening products. This stuff is incredible & does just what they claim it does. Haven’t looked back since.

    (0) (0)
  6. LIZ (verified owner)

    Fantastic product. Blonde hair never shines now my hair has shine. Pricey but well worth every cent highly recommend

    (0) (0)
  7. Jessica G. (verified owner)

    I have used twice and can notice a difference already. Great service from Synergy and fast shipping

    (0) (0)
  8. Aimee (verified owner)

    A product that really works!

    (0) (0)
  9. Rikki-Lee Howard-Cagabcab (verified owner)

    This saved my hairs life I have been using this product after damaging by my hair and I used this every time I washed my hair and the results are mind blowing

    (0) (0)
  10. Rachel T. (verified owner)

    Highly recommend this stuff! I’ve used it 4 times so far and my hair looks and feels AMAZING!

    (0) (0)
  11. Hannah (verified owner)

    Unbelievable! I never leave reviews because I am ultimately lazy but I couldn’t let this go without saying something. This product is actually incredible, my hair feels like silk and it looks like I’ve just had a hair cut. I’ve never ever experienced a product that worked so well. I’m in for life.

    (0) (0)
  12. Sylvie W. (verified owner)

    Amazing after one use I can really see the difference. I read reviews before buying as it’s pricey but so worth the investment in your hair ♥️♥️♥️

    (0) (0)
  13. Ingrid Dukker (verified owner)

    (0) (0)
  14. Charlotte Anderson (verified owner)

    Even after the first use of this my hair felt so much better, so much softer and sat so nice naturally. Highly recommend!

    (0) (0)
  15. Anonymous (verified owner)

    Amazing product! Synergy; great company to buy from- thank you!

    (0) (0)
  16. Jessica G. (verified owner)

    As a bleach blonde this stuff is a lifesaver. Repeat buyer and will be buying again.

    (0) (0)
  17. Sarah (verified owner)

    Due to a dying and stripping accident, my hair was extremely chemically damaged and it was going to have to be all cut off. After purchasing this product, my long hair is back to a healthy looking condition (about 90% better). This is my third bottle which will take it back and beyond what it was. As pricey as it is, it was worth it.

    (1) (1)
  18. Michelle C. (verified owner)

    Brilliant stuff, it has totally rescued my hair… highly recommend

    (0) (0)
  19. Teri T. (verified owner)

    My hair should be looking like a clown with how thin it it and how many times I have bleached, chemically straightened it and generally dyeing with colors. This product helps with the damage and make it become as healthy as possible. I will continue buying! ❤️

    (0) (0)
  20. Anonymous (verified owner)

    Amazing. Repaired my super damaged hair very quickly. I’d tried Kerastase Resistance and Olaplex previously, and for a long time … they don’t even come close to the repair I got from K18

    (0) (0)
  21. Lisa Wilson (verified owner)

    My daughter 13 and is a swimmer with super curly hair. This product is the best for her hair to prevent damage and help keep the curl banging!

    (0) (0)
  22. Keiren (verified owner)

    Amazing product. I can definitely feel the difference in my hair after using it.

    (0) (0)
  23. Anonymous (verified owner)

    Excellent product. Product arrived within two days, wow. Thank you for the extremely fast service.

    (0) (0)
  24. Sandy (verified owner)

    The first time I used K18 I noticed a significant difference.
    My hair is coarse, dry and brittle this product is like magic! I’ve spent $1000’s on haircare products promising ‘amazing results’ but not for me, however K18 is working for me! I love it and how it’s healing my hair to be healthy!!

    (0) (0)
  25. Sophie (verified owner)

    Amazing , noticable diffrence in my over processed hair.Hair instantly feels better an naturally dries well.10/10

    (0) (0)
  26. Doris (verified owner)

    The best product I have ever tried (and the dearest)!!!! I guess you get what you pay for!!! 🥰

    (0) (0)
  27. Michelle (verified owner)

    Excellent product

    (0) (0)
  28. Jessica Garing (verified owner)

    This is my holy grail product. I will continue to purchase its saved my bleach blonde hair

    (0) (0)
  29. Katie Holmes (verified owner)

    Purchase was so easy and came in the mail super fast!!!

    (0) (0)
  30. Kerstine V. (verified owner)

    Pricey but so worth it.
    I only use a pump for my hair. I have used it 6x and have seen noticeable results already

    (0) (0)
  31. Anonymous (verified owner)

    Amazing product. I’d have given up on being blonde by now if not for this. It’s easy to use and has repaired incredibly damaged bleached hair to the point where it actually feels like healthy hair again.

    (0) (0)
  32. Morgan M. (verified owner)

    I love how quick it is to use, just pop it in post shower no need to rinse! It’s done wonders for my bleach damaged hair.

    (0) (0)
Add a review

Your email address will not be published.

Salon Professional Products 70+ Leading Salon Professional Brands
Express Delivery With Delivery Notifications
Nationwide Salon Network Real Professional Care & Advice
Join Waitlist We will inform you when the product arrives in stock. Just leave your valid email address below.
Email Quantity We won't share your address with anybody else.