L'Oreal Keratin Alpha Sleek hair mask jar on a white background
L'Oreal Keratin Alpha Sleek hair mask jar with text highlighting benefits on a white background
Purple and blue spherical graphic with text about Keratin Alpha-shaper and amino acid chains on a black background.
Before and after comparison of hair treatment with product packaging displayed.
L'Oreal Professionnel Keratin Alpha Sleek Professional Hair Mask 250ml
Frizz control test with hair samples labeled 'Without Keratin Alpha Sleek', 'With Keratin Alpha Sleek', and 'After 2 weeks post use' on a white background.
L'Oreal Keratin Alpha Sleek hair care products with text indicating a professional anti-frizz routine.
Person with long, smooth hair and a five-star rating text on a white background
Hand holding a white sphere with text on how to apply it like a pro.
Illustration of flowers and fruits with labels for 'Orris and violet', 'Fig leaf', and 'Creamy sandalwood' on a white background.
L'Oreal Keratin Alpha Sleek hair mask jar on a white background
L'Oreal Keratin Alpha Sleek hair mask jar with text highlighting benefits on a white background
Purple and blue spherical graphic with text about Keratin Alpha-shaper and amino acid chains on a black background.
Before and after comparison of hair treatment with product packaging displayed.
L'Oreal Professionnel Keratin Alpha Sleek Professional Hair Mask 250ml
Frizz control test with hair samples labeled 'Without Keratin Alpha Sleek', 'With Keratin Alpha Sleek', and 'After 2 weeks post use' on a white background.
L'Oreal Keratin Alpha Sleek hair care products with text indicating a professional anti-frizz routine.
Person with long, smooth hair and a five-star rating text on a white background
Hand holding a white sphere with text on how to apply it like a pro.
Illustration of flowers and fruits with labels for 'Orris and violet', 'Fig leaf', and 'Creamy sandalwood' on a white background.

L'Oreal Professionnel Keratin Alpha Sleek Professional Hair Mask 250ml

250ml
This product is excluded from discount codes
€24,95
250ml 250ml €24,95 500ml 500ml €24,95
Authorised Stockists

L'Oréal Professionnel Keratin Alpha Sleek Professional Hair Mask is an intensive smoothing treatment designed to deeply nourish, soften and control frizz for a sleek, polished finish. Ideal for unruly, frizz-prone or hard-to-manage hair, this rich yet lightweight formula helps transform the hair fibre for improved smoothness, shine and manageability.

Powered by Keratin Alpha technology and amino acid chains, this professional mask works within the hair structure to help reshape and smooth the fibre from within. It helps reduce visible frizz from the first use while delivering up to three times less unwanted volume and long-lasting smoothness when used as part of the full routine. Enriched with conditioning agents such as shea butter and smoothing polymers, it leaves hair feeling softer, stronger and easier to style, with a glossy, salon-quality finish.

Benefits of L'Oréal Professionnel Keratin Alpha Sleek Professional Hair Mask:

  • Deeply nourishes and softens the hair fibre
  • Helps control frizz and reduce unwanted volume
  • Supports smoother, more manageable hair
  • Enhances shine for a polished finish
  • Helps protect against breakage and improve softness

How to Use:

After shampooing, apply evenly through lengths and ends. Leave on for 5 minutes, then rinse thoroughly. Use regularly or alternate with the Smooth Transformer for enhanced results.

Size: 250ml

What are the main benefits & what can it help with?

Frizzy Hair
Dry Hair
Damaged Hair
Thick Hair
Coarse Hair
L'Oreal Professionnel Keratin Alpha Sleek Professional Hair Mask 250ml
L'Oreal Professionnel Keratin Alpha Sleek Professional Hair Mask 250ml
€24,95
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