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Watch fragile hair bounce back with a soft, freshly‑revived feel.
Absorbs quickly without any tacky residue.
Helps reduce the look of snapped or rough ends.
Leaves hair smoother and easier to brush.
Description
K18 Leave-In Molecular Repair Mask 15ml is a lightweight treatment that helps restore hair strength from within. This leave-in formula uses biomimetic technology to reach deep into the hair’s inner structure, helping to smooth and soften strands without feeling heavy.
The creamy texture absorbs quickly, leaving hair feeling flexible and easier to brush. It works well after colouring, heat styling, or anytime hair feels rough or weak. Ideal for anyone wanting smoother, stronger and easier‑to‑manage hair with minimal effort, it’s designed to slot neatly into your routine without needing to rinse. Hair feels more balanced, less brittle, and visibly refreshed after each use.
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Directions
How To Use K18 Leave-In Molecular Repair Mask 15ml
Shampoo only; do not use conditioner.
Towel‑dry hair thoroughly.
Apply 1–3 pumps depending on length and thickness.
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.
Myristyl AlcoholConditioning 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.
Behentrimonium ChlorideConditioning 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.
Cetearyl AlcoholConditioning 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.
Hydrolyzed Wheat Protein PG-Propyl SilanetriolConditioning agents
Strengthening conditioner
A silicone-modified wheat protein that helps condition and reinforce the hair fibre.
May suit
People looking for smoother, stronger-feeling hair or added protection during styling.
Worth knowing
This ingredient combines the film-forming benefits of hydrolysed proteins with the smoothing qualities of silicone-like groups. It is commonly used to support hair resilience and reduce the feel of surface roughness.
Hydrolysed Oat ProteinProteins and amino acids
Strengthening and conditioning protein
A plant-derived protein that helps condition and support the hair’s strength.
May suit
People with dry, damaged, or chemically treated hair who want added softness and support.
Worth knowing
Hydrolysed proteins are broken into smaller fragments so they can more easily interact with the hair surface. Oat-derived proteins are known for their gentle, softening feel.
Polysorbate 20Thickeners and stabilisers
Solubiliser / emulsifier
Helps blend oil‑based ingredients into water‑based formulas for a smooth, even texture.
May suit
Those using products with essential oils or fragranced blends, as it helps disperse these evenly.
Worth knowing
It is widely used as a gentle solubiliser in both leave‑in and rinse‑off products. Its presence can improve product consistency and prevent ingredient separation.
HydroxyethylcelluloseThickeners and stabilisers
Thickener and stabiliser
A polymer that helps thicken and stabilise haircare formulas.
May suit
Those who prefer products with a smooth, uniform texture or need easier application and distribution.
Worth knowing
It is derived from cellulose and is widely used because it provides viscosity without weighing hair down. It also helps improve the feel and spreadability of many water-based products.
PhenoxyethanolPreservatives
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.
ParfumFragrance 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 AcidpH 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 SorbatePreservatives
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.
Sodium BenzoatePreservatives
Preservative
Helps protect water-based products from spoilage so they stay usable.
May suit
All products that need a preservative system.
Worth knowing
Often paired with other preservatives for broad protection.
Lactic AcidpH adjusters
pH adjuster
Helps adjust and maintain the product’s pH for optimal performance.
May suit
Those looking for formulas that help smooth the cuticle or gently refine the scalp surface.
Worth knowing
Lactic Acid can also provide mild hydrating and smoothing benefits in haircare. Its pH-balancing role helps support product stability and performance.