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About this product

L’Oréal Professionnel Keratin Alpha Sleek Mask

The L’Oréal Professionnel Keratin Alpha Sleek Mask is a professionally formulated hair mask that intensely nourishes, hydrates and smooths the hair. The formula with Keratin-Alpha Shaper and amino acid chains restructures the hair surface and strengthens natural keratin, making the hair visibly smoother, softer and more manageable.

The rich, sensorial texture penetrates deep into the hair fibre and instantly provides shine, frizz control and volume control, without weighing the hair down. The mask is suitable for all hair types, including coloured and chemically treated hair, and is free from alcohol and artificial colours.

When used as part of the complete Keratin Alpha Sleek routine, this mask helps keep the hair smooth, frizz-free and controlled for up to 2 weeks*.

Size

  • L’Oréal Professionnel Keratin Alpha Sleek Mask 250 ml

  • L’Oréal Professionnel Keratin Alpha Sleek Mask 500 ml

Key features

  • Professionally formulated smoothing and nourishing hair mask

  • With Keratin-Alpha Shaper and amino acid chains

  • Rich, nourishing texture

  • Intensely hydrates and softens the hair

  • Provides instant, visible shine

  • Controls frizz and volume

  • Supports long-lasting smoothness

  • Suitable for all hair types

  • Free from alcohol and artificial colours

Results & benefits

  • Long-lasting smooth and disciplined hair*

  • Strengthens and restructures the hair fibre

  • Makes the hair soft, supple and hydrated

  • Instant shine

  • Effective frizz and volume control

* Instrumental test after 4 applications of Shampoo + Smooth Transformer + Serum

How it works

Keratin-Alpha technology works deep within the hair fibre to repair damaged keratin and smooth the hair surface. This helps protect the hair against frizz and unwanted volume, while keeping it feeling supple, shiny and healthy.

How to use

  • Use this mask for instantly smoother hair

  • For long-lasting smoothness: use Keratin Alpha Sleek Smooth Transformer once a week and this mask on other wash days

  • After washing with Keratin Alpha Sleek Shampoo, apply evenly to the lengths and ends

  • Leave on for 5 minutes

  • Rinse thoroughly

In case of contact with the eyes, rinse immediately and thoroughly.

Specifications

  • Hair type: All hair types

  • Result: Smooth, shiny and frizz-free hair

  • Usage: Regular use, alternating with Smooth Transformer

  • Texture: Rich and nourishing

  • Size: 250 ml or 500 ml

Specifications
Brand
L'Oreal Professionnel
Specifications
Mask
Variant
250ml
SKU
3474637335687
EAN
3474637335687

L'Oreal Keratin Alpha Sleek Mask

The L’Oréal Professionnel Keratin Alpha Sleek Mask is a professional hair mask that intensely nourishes, hydrates, and smooths the hair.
€26,20 Regular price €40,00 You save €13,80
Variant2 variants
Variant
In stock · Order before 4 PM, delivered tomorrow
€50,00 to go for free shipping €0,00 / €50,00
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Have a question about this product?

Our specialists use these products themselves. Ask your question, we will answer within an hour.

Common question Can I use this product on its own?Yes. A shampoo or mask also works on its own; you’ll see results faster when used in combination.

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    Reviews

    Best behandeling heb ik geprobeerd met best

    Best behandeling heb ik geprobeerd met best prijs

    Ilham El bouzidi· 2026-07-27
    Heel goed masker

    Heel goed masker. Ik wil niks anders meer

    Mireille vanbockrijck· 2026-05-25
    Had er meer van verwacht

    Had er meer van verwacht, mijn haar is nog pluizig. Normaal zijn jullie producten wel goed.. ik blijf maar weer bij mijn oude shampoo de golden... van L'Oreal

    Marie De Brouwer· 2026-03-11

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