L'Oréal Professionnel Paris KERATIN ALPHA SLEEK serum

Hair styling product - Heat protectant for hair

FAQ (4)

1.7 fl oz

-11%

$ 35.94

$ 31.70

3.38 fl oz / $ 63.40

Total: $ 31.70

+ -

Expected delivery:

Wednesday 11/4/2026

*Approximate for orders whose destination is the provincial capital. In other cases there will be a delay of 1 day.

DON'T MISS...

L'Oréal Professionnel's Alpha Sleek Keratin Mirror Serum, formulated with 5% Keratin Sealer, seals the hair's keratin structure for lasting smoothness and frizz and volume control for up to 10 washes*. It controls frizz even in humidity up to 80%* and provides heat protection up to 230°C*.

Benefits:

Cut styling time in half**. Transform hair: smoothness and frizz control for up to 2 weeks when using the complete routine**. Heat activated. Blow dry. Use a flat iron for longer-lasting results.

This serum contains no artificial colors or alcohol.

Keratin is an ingredient of animal origin, also present in human hair. This product does not contain keratin.

*Instrumental tests

**Instrumental test with a routine of 4 applications of Shampoo + Smooth Transformer + Mirror Sleek Serum

How to use:

Shake before use.
Divide the detangled, washed and towel-dried hair into two sections.
Spray into your hand. Start with 2-4 sprays for fine to medium hair and 6-8 sprays for thicker hair.
Rub into your hands and distribute the product evenly from lengths to ends.
Do not clarify.
Heat activated. Blow dry. Use a flat iron for longer-lasting results.

Hair: All hair types
Textures: Serum
Format: Doser

EAN: 3474637335618
Hair: All hair types
Textures: Serum
Format: Doser
ingredients: dimethicone, bis-(morpholinomethyl c1-4 dialkoxysiloxy) dimethicone, bis-cetearyl amodimethicone, parfum / fragrance, linalool, citronellol, geraniol (f.i.l. n70063363/1).

The ingredient lists for our products are updated regularly. Please refer to the ingredient list on the packaging before using the product.

Brand Safety Warning

For external use only. In case of contact with eyes, rinse with water and keep out of reach of children.

Legal information of the brand

L’Oréal Professionnel, 14, rue Royale, 75008, París
https://www.loreal.com/es-es/espana/
corpes.contacto.loreal@loreal.com

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FAQ L'Oréal Professionnel Paris - KERATIN ALPHA SLEEK serum

What benefits does L’Oreal Professionnel Keratin Alpha Sleek Serum offer?

Translated by Google

-13/10/2026

Designed to perfect hair alignment, it offers the following actions:
• Restructuring properties of keratin that strengthen the surface of the fiber.
• Hydro-regulating anti-humidity action that eliminates frizz for a long time.
• It provides superior handling and an impeccable polished appearance with a silky finish.

What is the recommended application method for a polished finish?

Translated by Google

-09/08/2026

Place a small amount on the palms of your hands and spread thoroughly through damp hair before drying, or through dry hair to seal split ends and control frizz. Do not rinse.

What hair types or needs is this smoothing serum intended for?

Translated by Google

-15/05/2026

Prescribed for frizzy, unruly, rebellious hair or hair subjected to straightening treatments that require rigorous volume control and professional-level smoothness.

How does Keratin Alpha Sleek Serum from L’Oreal Professionnel act on the hair fiber?

Translated by Google

-02/03/2026

It deploys a keratin-rich micro-protective layer over the hair shaft, mechanically filling the cortex fissures and aligning the cuticle to block the entry of ambient moisture.

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