L'Oréal Professionnel Keratin Alpha Sleek Serum 50ml

L'Oréal Professionnel Keratin Alpha Sleek Serum

Protect against humidity, heat and unwanted volume with L'Oréal Professionnel Keratin Alpha Sleek Serum – a heat-activated finishing treatment for smoother, shinier and more manageable hair.

Designed to complete the Keratin Alpha Sleek routine, this lightweight leave-in serum helps resist humidity levels of up to 80%³ while providing heat protection up to 230°C⁴. Activated by heat styling, it smooths the hair, controls unwanted volume and helps reduce daily styling time by half⁵. Hair is left sleek, polished and easier to manage, with longer-lasting results when finished with a straightening iron. The formula is free from artificial colourants and alcohol.

Key Benefits:

• Helps resist humidity levels of up to 80%³
• Provides heat protection up to 230°C⁴
• Smooths the hair and controls unwanted volume
• Helps reduce daily styling time by half⁵
• Heat-activated for enhanced smoothing results
• Leaves hair sleek, shiny and more manageable
• Suitable for use before blow-drying and straightening
• Free from artificial colourants and alcohol
• Does not contain keratin

How to Use:

Shake well before use. Apply to freshly washed, towel-dried and detangled hair.

Divide the hair into two sections, then spray the serum into your hands. Use two to four sprays for fine to medium hair or six to eight sprays for thicker hair. Rub your hands together and distribute evenly through the mid-lengths and ends. Do not rinse.

Blow-dry the hair completely to activate the smoothing technology. Finish with a straightening iron for longer-lasting results.

Store in a cool, dry place. Clean and lock the pump after each use.

³Instrumental testing using the complete routine after four applications of Smooth Transformer.
⁴Instrumental testing.
⁵Instrumental testing after four applications of Keratin Alpha Sleek Shampoo, Smooth Transformer and Serum.