L'Oreal Professionnel

L'Oréal Keratin Alpha Sleek Smooth Transformer Anti-Frizz 200ml

Price history

Price changes in the past 30 days

May 22, 2026 23.90 €
May 06, 2026 24.90 €
Regular price 23.90 € Sale price 23.90 € Regular price 32.60 € Unit price 79.67 €  per  l
Sale 8.70 € (26.69%)
Tax included. 
In stock

The L'Oréal Professionnel Keratin Alpha Sleek Smooth Transformer 200ml is a smoothing treatment that controls frizz and smooths the hair fiber. Formulated for those seeking a professional anti-frizz solution for all hair types.

What is Smooth Transformer

L'Oréal professional treatment that acts on the hair structure to reduce unwanted volume and control frizz. The formula penetrates the hair fiber, creating a long-lasting protective barrier. It is part of the Keratin Alpha Sleek system, L'Oréal Professionnel's professional anti-frizz protocol.

Who it's for

Suitable for all hair types that suffer from frizz, excessive volume, or are difficult to manage. Particularly effective on wavy, curly, or chemically treated hair that tends to swell with humidity.

Benefits of the treatment

Visibly reduces frizz from the first application. Smooths the hair surface, making it more manageable during styling. Creates a barrier against humidity that helps maintain the style longer. Hair feels soft to the touch without being weighed down.

Measurable results

Keratin technology acts on open cuticles, which are primarily responsible for frizz. The treatment seals the surface, creating uniformity and shine. The smoothing effect lasts for 2-3 weeks with regular use of complementary products.

Technology and active ingredients

The formula contains keratin, a protein naturally present in hair that strengthens the internal structure. The Alpha Sleek system combines smoothing agents that work on the outer surface of the hair. It does not contain formaldehyde or aggressive substances that damage the hair fiber.

How to apply

Wash hair with Keratin Alpha Sleek shampoo. Towel dry excess water. Apply the product to lengths and ends, avoiding the roots. Distribute evenly with a wide-tooth comb.

Processing time and rinsing

Leave on for 15 minutes, then rinse thoroughly. Proceed with blow-drying using a hairdryer and brush to activate the treatment. For optimal results, complete with Mirror Sleek serum on the ends before drying.

Final result

Visibly smoother and more disciplined hair. Hair appears neat even in high humidity conditions. Frizz is controlled without eliminating the hair's natural movement. The texture is silky, and hair glides through the fingers.

Frequently asked questions

How long does the anti-frizz effect last?
On average 2-3 weeks with the use of complementary products from the line. The effect varies depending on hair type and washing frequency.

Can it be used on colored hair?
Yes, compatible with colored or treated hair. It does not interfere with artificial pigments and, by smoothing the cuticles, enhances color brilliance.

Is a flat iron needed after application?
It is not mandatory but enhances the smoothing effect. If using a flat iron, apply Mirror Sleek serum as a heat protectant beforehand. Blow-drying with a round brush already provides a good result.

How often can the treatment be repeated?
Once a week. Alternate with the Keratin Alpha Sleek mask to maintain hydrolipidic balance.

Technical details

Format: 200ml
Brand: L'Oréal Professionnel
Line: Keratin Alpha Sleek
Product type: Anti-frizz smoothing treatment
Suitable for: All hair types
Main action: Frizz control and smoothing
Formaldehyde-free: Yes

Why buy on Planethair.it

Since 2000, we have been selecting professional products for hairdressers and end customers. The first Italian e-commerce specializing in salon brands, with over 25 years of experience and dedicated pre and post-sales assistance. Original L'Oréal Professionnel products with official guarantee. Free samples with every order.

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