K18 • Leave - in Molecular Repair Hair Mask 5ml - Colorful Black

K18 • Leave-in Molecular Repair Hair Mask

5ml
€11,90 EUR
€11,90 EUR €13,00 EUR
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K18 • Leave - in Molecular Repair Hair Mask 5ml - Colorful Black
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K18 • Leave-in Molecular Repair Hair Mask

K18

K18 • Leave-in Molecular Repair Hair Mask

€11,90 EUR
€11,90 EUR €13,00 EUR
Capacity

The K18 Molecular Repair Hair Mask is a leave-in restorative treatment designed to help repair damaged hair at a molecular level in just 4 minutes.

Its technology is based on K18PEPTIDE™, a patented peptide that helps reconnect keratin chains weakened by bleaching, coloring, chemical services, or repeated heat styling.

This treatment is suitable for all hair types, including curly, coily, and kinky hair, when they lack strength, elasticity, softness, or when the hair fiber appears sensitized.

Available sizes:

  • 5ml (for one application)
  • 15ml
  • 50ml

See other K18 products
Learn more

The K18 Molecular Repair Hair Mask is not a classic rinse-out mask.

It is used after shampooing, on towel-dried hair, without prior conditioner. Its leave-in formula works deep down to help restore the hair's internal structure, where damage from chemical treatments, heat, or repeated coloring can weaken the hair fiber.

The K18PEPTIDE™ is designed to mimic certain natural hair structures. It helps reconnect broken polypeptide chains and, consequently, strengthens the hair fiber from within.

Result: hair gradually regains a feeling of strength, suppleness, softness, and bounce, without feeling heavy when used in appropriate amounts.

This treatment is particularly beneficial after bleaching, coloring, straightening, perming, or when hair has lost its natural elasticity.
Usage tips
  • After shampooing, do not apply conditioner.
  • Towel dry hair thoroughly.
  • Apply 1 to 3 pumps of K18 Molecular Repair Hair Mask depending on hair length, thickness, and density.
  • Distribute the product from ends to roots, focusing on the most damaged areas.
  • Leave on for 4 minutes. Do not rinse.

After 4 minutes, detangle if necessary, then apply your usual styling products (leave-in, styling cream, jelly, oil according to your routine).

Use for 4 to 6 consecutive washes after a technical service or a period of high damage, then as needed.

Additional tips:

Do not use conditioner before K18: it can leave a film on the hair fiber and limit peptide penetration.

A small amount is enough. For fine or sparse hair, start with just one pump.

For very dense, thick, curly, or coily hair, work in sections to better distribute the treatment.
Composition

Water (Aqua), Alcohol Denat., Propylene Glycol, Cetearyl Alcohol, Dicaprylyl Ether, Cetyl Esters, Behentrimonium Chloride, Polysorbate 20, sh-Oligopeptide-78 (K18PEPTIDE™), Hydrolyzed Wheat Protein, Hydrolyzed Wheat Starch, Isopropyl Alcohol, Tocopherol, Phenoxyethanol, Potassium Sorbate, Citric Acid, Fragrance (Parfum), Geraniol, Linalool, Hexyl Cinnamal, Benzyl Alcohol.

Vegan, cruelty-free, and color-safe formula.

Why choose Colorful Black?

Fast delivery France / Europe / Overseas

Free delivery to a collection point * on orders over €79

Also available in our Paris store

Payment in 3 installments with no fees (Scalapay)

Available at : 01 42 36 54 14 or message

Why choose K18 • Leave-in Molecular Repair Hair Mask ?

Targeted Repair for Damaged Hair

K18 helps repair damage from bleaching, coloring, chemical services, and heat.

Its technology works at the core of the hair fiber to strengthen weakened hair and improve its softness, smoothness, and resilience.

K18PEPTIDE™ Technology

K18PEPTIDE™ is a patented peptide designed to mimic some of the hair's natural structures.

It helps reconnect broken keratin chains to support deeper and longer-lasting repair than a surface treatment.

4-minute leave-in treatment

This mask is applied after shampooing, on towel-dried hair, without prior use of conditioner.

After 4 minutes of exposure, it does not need to be rinsed out: you can directly proceed with your usual styling products.

Suitable for all hair types

K18 can be used on straight, wavy, curly, coily, or kinky hair.

For textured hair, it is particularly useful when curls have lost their strength, spring, or definition after styling techniques or repeated heat use.

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Frequently Asked Questions about K18 • Leave-in Molecular Repair Hair Mask

Who is the K18 Molecular Repair Hair Mask for?

It is for hair that is damaged, sensitized or weakened by color, bleaching, chemical services or heat.

Is it a classic rinse-out mask?

No, it's a leave-in treatment. It is applied after shampooing, on towel-dried hair, and then left in the hair.

Why shouldn't conditioner be used before K18?

Conditioner can leave a film on the hair fiber and limit the penetration of K18PEPTIDE™. K18 should therefore be applied to clean hair, without conditioning beforehand.

How long should it be left on?

The treatment should be left on for 4 minutes before detangling or applying your usual styling products. It does not need to be rinsed out.

How many pumps should be used?

The brand recommends 1 to 3 pumps depending on hair length and density. For thick or very textured hair, work in sections for better distribution of the treatment.

Is it suitable for curly, coily, and kinky hair?

Yes, it is suitable for all hair types. For textured hair, it can help restore strength, suppleness, and bounce after chemical or thermal damage.

How often should K18 be used?

After a chemical treatment or for very damaged hair, it can be used for 4 to 6 consecutive washes, then as needed for maintenance.

Can styling products be applied after K18?

Yes. Simply wait the 4 minutes of processing time, then apply your leave-in, styling cream, gel, mousse, or oil as usual.