Staff Choice
K18 Leave-In Molecular Repair Hair Mask
K18 Leave-In Molecular Repair Hair Mask
K18 Leave-In Molecular Repair Hair Mask
K18 Leave-In Molecular Repair Hair Mask
K18 Leave-In Molecular Repair Hair Mask
"I am so glad I took the plunge and purchased k18. My stressed out curls are coming back to life!" - Stacey
K18

Leave-In Molecular Repair Hair Mask 50ml

4.8 (19)
$109.95
Only 10 remaining in stock!
4 payments of with
  • Delivery
  • Click & Collect
In Stock - Free Shipping
Estimated delivery: Wed, Aug 19th - Mon, Aug 24th

Free Click and collect is available at checkout. Orders are ready within 1 hour during opening hours. Store Address: 56 Parer Rd, Airport West, VIC Australia 3042 Phone (03) 9999 5902

Leave-In Molecular Repair Mask Mini
FREE K18 Leave-In Molecular Repair Hair Mask Mini
With your next K18 purchase over $60. Limit 1 per customer.
Wash Me All Over Hand & Body Wash Gift
FREE Eleven Wash Me All Over Hand & Body Wash 100ml
With all sitewide orders over $129.
Promotion
Save 15% with code NEW15 off your first order!
Limit 1 use. Exclusions apply, including sale items.
Most Helpful Review
"I am so glad I took the plunge and purchased k18. My stressed out curls are coming back to life!" - Stacey
Why You’ll love it
Cruelty Free
Paraben Free
Phthalate Free
Sodium Free
Synthetic Colour Free
Feel like you’ve rewound years of damage in a four-minute pause.
Hair feels soft, springy, and less fragile under your fingers.
Helps colour-treated strands look smoother, less frizzy, more polished.
Lightweight, leave-in formula that doesn’t weigh fine hair down.
Description
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Directions
Ingredients
  • Water (Aqua) Solvents
    Solvent

    Water acts as the main solvent that dissolves and distributes other ingredients in a formula.

    May suit

    Anyone using liquid haircare products, as water is a core component.

    Worth knowing

    It helps create a workable texture and allows surfactants, conditioners and other actives to perform effectively.

  • Alcohol Denat. Solvents
    Solvent

    A fast-evaporating solvent that helps dissolve ingredients and improve product dry time.

    May suit

    People who use styling products that benefit from quick drying or a lightweight feel.

    Worth knowing

    Its quick evaporation can help reduce residue and support a clean finish in styling formulas. Some may notice it can feel slightly drying in leave-in products depending on hair type.

  • Propanediol Humectants
    Hydrating humectant

    Helps attract and hold moisture in hair and supports a smooth, conditioned feel.

    May suit

    Those wanting lightweight hydration without heaviness.

    Worth knowing

    It is often used as a gentle alternative to glycol-based humectants and can also help improve product texture and absorption.

  • Myristyl Alcohol Conditioning agents
    Fatty alcohol conditioner

    A fatty alcohol that helps soften hair and add a smoother feel while supporting product texture.

    May suit

    Those looking for added slip and softness, especially in conditioners or masks.

    Worth knowing

    Fatty alcohols are different from drying alcohols and are commonly used to create rich, creamy textures. They also help formulators stabilise emulsions.

  • Cetearyl Alcohol Conditioning agents
    Fatty alcohol conditioner

    A fatty alcohol that helps soften hair and improve the texture of formulations.

    May suit

    People looking for smoother, more manageable hair or richer, creamier product textures.

    Worth knowing

    Despite the name, fatty alcohols are moisturising and conditioning rather than drying. They also help stabilise and thicken many haircare formulas.

  • Behentrimonium Chloride Conditioning agents
    Conditioning agent

    A conditioning agent that helps detangle and soften, reducing static and roughness.

    May suit

    Most hair types, especially tangle-prone or coarse hair.

    Worth knowing

    A common conditioner ingredient despite the chloride name, which simply describes its chemistry.

  • Amodimethicone Silicones
    Conditioning silicone

    A conditioning silicone that targets rougher areas of the hair to smooth and protect.

    May suit

    Damaged, frizz-prone or colour-treated hair wanting targeted smoothing.

    Worth knowing

    Designed to deposit where hair needs it most. Some prefer silicone-free formulas by choice.

  • Pentaerythrityl Tetra-di-t-butyl Hydroxyhydrocinnamate Thickeners and stabilisers
    Antioxidant stabiliser

    An antioxidant that helps stabilise formulas and protect ingredients from degrading over time.

    May suit

    Those interested in product longevity or using heat-styling or UV-exposed products that benefit from stable formulations.

    Worth knowing

    It is commonly used in many personal care products to help maintain formula quality. It does not affect the feel or performance of the product on hair.

  • Cetrimonium Chloride Conditioning agents
    Conditioning agent

    A conditioning agent that helps smooth and soften the hair while reducing static and tangles.

    May suit

    People looking for improved manageability, detangling and smoother-feeling hair.

    Worth knowing

    It is a commonly used quaternary ammonium compound that helps conditioners spread easily through the hair. It is effective even at low levels, which is why it appears frequently in rinse-off products.

  • PPG-3 Benzyl Ether Myristate Conditioning agents
    Emollient & conditioning agent

    Helps soften the hair and improve slip for easier detangling and smoother feel.

    May suit

    People looking for smoother, more manageable hair or products with a lightweight, non-greasy emollient.

    Worth knowing

    This synthetic emollient is commonly used to add spreadability and a silky finish to haircare formulas. It also helps enhance the overall texture of creams and conditioners.

  • Hydrolyzed Wheat Protein Proteins and amino acids
    Protein

    A plant-derived protein that helps smooth and support the hair surface.

    May suit

    Hair wanting added body, smoothness or temporary strength.

    Worth knowing

    A common protein in repair and volumising formulas.

  • Hydrolysed Wheat Starch Proteins and amino acids
    Strengthening and conditioning agent

    A hydrolysed plant-derived starch that helps condition and lightly strengthen the hair.

    May suit

    Those looking for added softness, light smoothing or gentle strengthening benefits.

    Worth knowing

    Its smaller molecular size allows it to coat hair more easily than regular starch, offering a softening effect without heaviness. It is commonly used in both rinse-off and leave-in formulations.

  • Cetyl Esters Conditioning agents
    Emollient / slip enhancer

    Provides slip and softness while helping to smooth the hair’s surface.

    May suit

    People looking for smoother, more manageable hair textures.

    Worth knowing

    Cetyl esters are wax‑like emollients that improve product spreadability and give a soft, conditioned feel. They are commonly used to enhance texture without heaviness.

  • Parfum Fragrance ingredients
    Fragrance

    Gives the product its scent.

    May suit

    People who enjoy a scented product.

    Worth knowing

    Fragrance preference is personal. Some people prefer fragrance-free formulas by choice.

  • Citric Acid pH adjusters
    pH adjuster

    Fine-tunes the product pH, which can help the hair surface feel smooth.

    May suit

    Most hair types as part of a balanced formula.

    Worth knowing

    Usually present in small amounts to balance the formula.

  • Potassium Sorbate Preservatives
    Preservative

    Helps keep haircare formulas stable by preventing the growth of microbes.

    May suit

    Anyone who uses water-based products that benefit from reliable preservation.

    Worth knowing

    It is commonly used alongside other preservation systems to maintain product freshness and extend shelf life. It is generally well tolerated in rinse-off and leave-in products.

  • Disodium EDTA Chelating agents
    Chelating agent

    Binds to minerals from hard water so the product works consistently and stays stable.

    May suit

    All products, especially in hard-water areas.

    Worth knowing

    Used in tiny amounts to keep formulas performing reliably.

  • C11-15 Pareth-7 Cleansers / surfactants
    Non-ionic surfactant

    A non-ionic surfactant that helps cleanse and allows oil and water to mix evenly.

    May suit

    Those looking for effective yet mild cleansing or improved product spreadability.

    Worth knowing

    It is commonly used in shampoos and styling products to support gentle cleansing and stable formulations. Non-ionic surfactants like this are valued for being versatile in different formula types.

  • Laureth-9 Cleansers / surfactants
    Surfactant and emulsifier

    Laureth-9 helps blend oil and water components and provides light cleansing or solubilising action.

    May suit

    Those looking for products that spread evenly or contain stable blends of oils and water-based ingredients.

    Worth knowing

    It is a versatile non-ionic surfactant often used at low levels to support product texture and stability. It can also assist with foaming and rinse-off performance.

  • Glycerin Humectants
    Humectant

    Attracts and holds water to help hair feel hydrated and soft.

    May suit

    Dry or dehydrated hair, and many curl and moisture routines.

    Worth knowing

    A very common, well-tolerated humectant used across countless products.

  • Trideceth-12 Cleansers / surfactants
    Nonionic surfactant and solubiliser

    Helps blend oil‑based and water‑based ingredients and provides gentle cleansing action.

    May suit

    Those using products that need light cleansing or stable blends of oils, silicones, or fragrances.

    Worth knowing

    It is commonly used to solubilise fragrance or silicone ingredients in shampoos and treatments. Its mild, nonionic nature means it typically works well alongside other surfactants.

  • Phenoxyethanol Preservatives
    Preservative

    Helps keep the product stable and pleasant to use after opening.

    May suit

    All products that need protecting from spoilage.

    Worth knowing

    A very common, well-studied preservative used at low levels.

  • Polyquaternium-37 Conditioning agents
    Film-forming conditioner

    A conditioning polymer that helps smooth the hair and improve manageability.

    May suit

    Those looking for softer, more manageable hair or extra slip in styling products.

    Worth knowing

    It forms a lightweight film on the hair to reduce static and enhance glide without leaving heavy residue. It is commonly used in both rinse-off and leave-in formulas.

  • Oryza Sativa (Rice) Bran Oil Oils and butters
    Emollient oil

    A lightweight plant oil that helps condition and soften the hair.

    May suit

    Those seeking added softness, shine, or nourishment without a heavy feel.

    Worth knowing

    Rice bran oil is rich in fatty acids and antioxidants, which can support a smooth, conditioned hair feel. It is commonly used in both leave‑in and rinse‑off formulas.

  • Argania Spinosa Kernel Oil Oils and butters
    Conditioning oil

    Softens and nourishes the hair, adding slip and a conditioned, glossy feel.

    May suit

    Dry, dull or frizz-prone hair.

    Worth knowing

    A popular conditioning oil used across many treatment and shine products.

  • Helianthus Annuus (Sunflower) Seed Oil Oils and butters
    Emollient oil

    A plant-derived oil that helps soften and condition the hair and scalp.

    May suit

    Those seeking lightweight natural oils for moisture, shine or scalp comfort.

    Worth knowing

    It is rich in fatty acids that support hair softness without feeling overly heavy. Often used as a carrier oil in both rinse-off and leave-in formulas.

  • Rosmarinus Officinalis (Rosemary) Leaf Extract Botanical extracts
    Botanical extract

    A plant-derived extract often used to support scalp comfort and provide antioxidant benefits.

    May suit

    Those interested in botanical ingredients or products aimed at maintaining a balanced, refreshed scalp.

    Worth knowing

    Rosemary leaf extract is widely used in haircare for its traditional association with invigorating and clarifying properties. It can be included in both everyday and specialised scalp-focused formulas.

  • Tocopherol Preservatives
    Antioxidant

    An antioxidant that helps support product stability and can provide conditioning benefits to hair.

    May suit

    Those wanting added nourishment or antioxidant support in their haircare routine.

    Worth knowing

    Tocopherol is commonly included to help protect oils in a formula from oxidising and to offer light conditioning benefits. It is widely used in both skincare and haircare products.

  • Acetic Acid pH adjusters
    pH adjuster

    Helps regulate a product’s acidity for optimal hair and scalp performance.

    May suit

    People using products that rely on precise pH levels for smoothness or shine.

    Worth knowing

    Acetic acid is a simple organic acid also found in vinegar and is commonly used to keep formulas stable and effective. At low levels, it can help support cuticle lay-down, contributing to smoother-feeling hair.

Questions and Answers

Questions and Answers

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Reviews

Reviews: K18 Leave-In Molecular Repair Hair Mask

4.8 (19)
16
3
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Most Helpful Review
A must-have product for bleached hair!
Written by Natarsha On 03/04/2026
4 people found this helpful
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