L'Oréal Professionnel Keratin Alpha Sleek Smoothing Trio

A professional 3-step anti-frizz and smoothing routine for hair that is difficult to manage, prone to frizz, excessive volume or lacking smoothness.

The L'Oréal Professionnel Keratin Alpha Sleek Smoothing Trio combines the Sulfate-Free Shampoo, Professional Hair Mask and Smooth Transformer to cleanse, deeply nourish and progressively transform the hair for longer-lasting smoothness and control.

Powered by Keratin-Alpha Shaper and Amino-Acid Chains, the range works at the hair's Keratin Alpha level to reshape and smooth the fibre while maintaining hair integrity. Despite the range name, L'Oréal Professionnel confirms that these products do not contain animal-derived keratin.

Cleanse → Nourish → Transform → Smooth → Control Frizz and Volume

What's Included?

L'Oréal Professionnel Keratin Alpha Sleek Sulfate-Free Shampoo

A professional sulfate-free smoothing shampoo with an ultra-creamy texture that gently cleanses while helping smooth and reinforce the hair fibre.

It helps soften and hydrate the hair while providing instant shine, frizz control and volume control. The shampoo is free from sulfated surfactants, artificial colourants and alcohol.

L'Oréal Professionnel Keratin Alpha Sleek Professional Hair Mask

A rich professional smoothing mask designed to deeply nourish, hydrate and soften while helping control frizz and unwanted volume.

It is the regular conditioning treatment within the Alpha Sleek routine and is designed to be used on wash days when the Smooth Transformer is not being applied.

Apply after shampooing, leave for 5 minutes, then rinse.

L'Oréal Professionnel Keratin Alpha Sleek Smooth Transformer

The hero treatment of the range.

Smooth Transformer is a progressive professional smoothing treatment designed to deliver long-lasting smoothness while controlling frizz and volume.

L'Oréal Professionnel reports 5× smoother hair, 2× less frizz and +77% instant shine in instrumental testing. With the complete routine, the brand reports smoothness, frizz and volume control lasting for up to 2 weeks after repeated applications.

It is designed to be used once a week, with performance building progressively and peaking after four applications.

Why You'll Love It

• Complete professional smoothing routine
• Designed for frizz and difficult-to-manage hair
• Helps control unwanted volume
• Provides long-lasting smoothness
• Leaves hair softer and more manageable
• Helps improve shine
• Makes everyday styling faster
• Suitable for all hair types
• Suitable for natural and colour-treated hair
• Shampoo is sulfate-free
• Progressive smoothing technology
• Smooth Transformer provides increasingly effective results with repeated use
• Powered by Keratin-Alpha Shaper and Amino-Acid Chains
• Helps smooth while preserving hair integrity
• Professional L'Oréal Professionnel technology

Who Is It For?

Ideal for:

Frizzy hair
Unruly hair
Hair with excessive volume
Hair that is difficult to smooth
Hair prone to humidity-related frizz
Wavy hair requiring greater control
Curly hair when a smoother result is desired
Coarse or resistant hair
Natural hair
Colour-treated hair
Hair requiring faster, easier styling
Anyone wanting longer-lasting smoothness without a permanent straightening service

Importantly, Keratin Alpha Sleek is not positioned only for naturally straight hair. L'Oréal Professionnel states that the Smooth Transformer is suitable for all hair types, including natural and coloured hair.

Pair Me With

L'Oréal Professionnel Keratin Alpha Sleek Mirror Sleek Serum is the most important additional product to complete this routine.

It is the leave-in finishing step of the official Alpha Sleek system, designed to support long-lasting smoothness, frizz and humidity control while providing shine and heat protection up to 230°C.

For the strongest Alpha Sleek results, the complete official routine is:

Sulfate-Free Shampoo → Smooth Transformer → Mirror Sleek Serum

On wash days when Smooth Transformer is not used:

Sulfate-Free Shampoo → Professional Hair Mask → Mirror Sleek Serum

Keratin Alpha Sleek product range | For long-lasting smoothness

Wash with LOREAL PROFESSIONNEL Alpha Sleek Sulfate-Free Shampoo and rinse thoroughly.
Apply LOREAL PROFESSIONNEL Alpha Sleek Professional Hair Mask to the mid-lengths and ends. Leave on for 3–5 minutes before rinsing.
Apply LOREAL PROFESSIONNEL Alpha Sleek Smooth Transformer to towel-dried hair. Blow-dry and style as desired. Do not rinse.

Aqua / Water / Eau, Cetearyl Alcohol, Behentrimonium Chloride, Citric Acid, Cetyl Esters, Glycerin, Glycine, Isopropyl Alcohol, Aminopropyl Dimethicone, Potassium Hydroxide, Isododecane, Phenoxyethanol, Bis(C13-15 Alkoxy) PG-Amodimethicone, Butyrospermum Parkii (Shea) Butter, Steareth-100, Propylene Glycol, Hydroxypropyl Guar, PEG-150/Decyl Alcohol/SMDI Copolymer, Tetramethyl Acetyloctahydronaphthalenes, Polyquaternium-37, Linalyl Acetate, Propylene Glycol Dicaprylate/Dicaprate, Chlorhexidine Digluconate, Carvone, Citrus Limon Peel Oil, Limonene, Coumarin, Linalool, Citrus Aurantium Bergamia Peel Oil, Butylene Glycol, PPG-1 Trideceth-6, Pinene, Acrylates/Stearyl Methacrylate Copolymer, Sorbitan Oleate, Carbomer, Sodium Lactate, Taurine, Polysorbate 20, EDTA, Palmitoyl Tripeptide-1, Palmitoyl Tetrapeptide-7, Parfum / Fragrance.

Key active ingredients

Glycine
Taurine
Shea Butter (Butyrospermum Parkii Butter)
Aminopropyl Dimethicone
Bis(C13-15 Alkoxy) PG-Amodimethicone
Palmitoyl Tripeptide-1
Palmitoyl Tetrapeptide-7
Citric Acid

Note: LOREAL PROFESSIONNEL states that ingredient lists may vary slightly by country and may be updated over time. Always refer to the ingredient list printed on the product packaging for the version sold in your market.