New Variant Media

[Keratin Alpha Sleek] Professional sulfate free* shampoo for long-lasting smoothness, frizz & volume control.

Transforms hair for long lasting of smooth, frizz & volume control. Provides 76% more shine.**

300 ml

  • 300 ml
Find a salon

Description

Keratin Alpha Sleek Professional sulfate-free* shampoo by L'Oréal Professionnel, formulated with Keratin-alpha shaper and Amino-acid chains.

The professional shampoo has a luxurious, ultra-creamy texture.

It gently cleanses the fiber while smoothing and reinforcing hair keratin. It softens and hydrates hair, bringing an instant shine, frizz & volume control. Suitable for all hair types.

Use full routine to transform hair for 2 weeks of smooth, frizz & volume control**.

This shampoo is sulfate free*, artificial colorant free, and alcohol free.

*No sulfated sulfactants.
**Consumer test after 4 applications on 67 consumers.

Results & Benefits

Transform hair for 2 weeks of smooth, frizz & volume control*.

Softens and hydrates hair.**

Brings an instant shine to hair**

Controls frizz & volume.**

*Consumer test after 4 applications on 67 consumers.
**Instrumental tests.

Instruction of use

Apply evenly on wet hair. Lather until a rich foam is obtained. Rinse.

In case of contact with eyes, rinse immediately and thoroughly. Follow with Keratin Alpha Sleek Smooth Transformer once a week for long-lasting smoothness. On other wash days of the week, use our professional mask instead of Smooth Transformer.

Ingredients & Safety Warning
The ingredients list is subject to change and depends on country location selling. Consumers should refer to the product packaging for the most relevant ingredients list. In case of problem, please contact the consumer care center.

Ingredients
INGREDIENTS: AQUA / WATER, CETEARYL ALCOHOL, AMMONIUM HYDROXIDE, AMMONIUM BICARBONATE, PROPYLENE GLYCOL, C15-19 ALKANE, STEARETH-20, m-AMINOPHENOL, 2-AMINO-3-HYDROXYPYRIDINE, ASCORBIC ACID, SODIUM METABISULFITE, HYDROXYBENZOMORPHOLINE, STEARETH-2, STEARIC ACID, THIOGLYCERIN, PALMITIC ACID, TOLUENE-2,5-DIAMINE, CANDELILLA CERA / CANDELILLA WAX, N,N-BIS(2-HYDROXYETHYL)-p-PHENYLENEDIAMINE SULFATE, MYRISTIC ACID, CETETH-10, TETRASODIUM GLUTAMATE DIACETATE, 2,4-DIAMINOPHENOXYETHANOL HCL, PARFUM / FRAGRANCE (F.I.L. Z70052113/2)."

INNOVATION

Keratin Alpha Sleek. Transform hair for longlasting smooth, frizz & control.

PRO TIPS

How to apply the shampoo like a Pro.

  1. Apply evenly on wet hair. 
  2. Lather until a rich foam is obtained. Rinse. 
  3. Follow with Keratin Alpha Sleek Smooth Transformer once a week for long-lasting smoothness for up to 2 weeks*. On other wash days of the week, use our professional mask instead of Smooth Transformer.

*Consumer test after 4 applications on 67 consumers.

block-kas-2026-01-pdp-shampoo-tips

Your questions and our answers on Keratin Alpha Sleek range.

  • What is Keratin Alpha?
    It is the primary protein that forms the very core structure of your hair, residing at the deepest level of the fiber. It is the building block that dictates each strand’s shape, strength, and elasticity.

  • Why does Keratin Alpha determine hair outer shape?
    Alpha-keratin is the fundamental structural protein that forms the hair. Its internal helical arrangement, along with the extensive network of bonds within the hair's cortex, dictates the strand's overall geometry, and ultimately determines if hair appears straight, wavy, or curly.

  • What hair needs does this range address?
    Keratin Alpha Sleek range has been formulated with stylists for all those who want to reduce frizz, improve smoothness, and keep hair straighter and softer, with results that last. In fact, while other at-home smoothing treatments only act on the surface of the hair for temporary result, this franchise transforms hair at Keratin Alpha level, for 2 weeks of smooth, frizz & volume control*, ensuring easier and faster daily styling. It is suitable for all hair types.

  • Does Keratin Alpha Sleek range contain keratin? ​
    Keratin is an animal-derived ingredient, also found in human hair. These products don’t contain keratin, but reprogram hair from deep inside the fiber at Keratin Alpha level, reshaping Keratin Alpha chains for 2 weeks of smooth, frizz-controlled hair*.