• Keratin Alpha Sleek serum bottle on a white background
  • L'Oreal Keratin Alpha Sleek serum bottle with text highlighting features on a white background
  • Hand with product on palm and text on how to apply it like a pro.
  • Before and after comparison of hair treatment with a woman's hair shown, followed by L'Oreal Keratin Alpha Sleek products.
  • Purple and blue spherical graphic with text about Keratin Alpha-shaper and amino acid chains on a black background.
  • Frizz control test with hair samples labeled 'Without Keratin Alpha Sleek', 'With Keratin Alpha Sleek', and 'After 2 weeks post use' on a white background.
  • Three strands of hair labeled 'Before', 'After', and 'After 2 weeks' on a white background with text about frizz control.
  • L'Oreal Keratin Alpha Sleek hair care products with step-by-step guide on a white background
1 8

L'Oréal Professionnel Keratin Alpha Sleek Mirror Sleek Serum

L'Oréal Professionnel Keratin Alpha Sleek Mirror Sleek Serum

29946

£19.95
£19.95
Sale Sold out (£23.94 Inc. VAT)
Shipping calculated at checkout.

L'Oréal Professionnel Keratin Alpha Sleek Mirror Sleek Serum is a lightweight finishing serum designed to control frizz, enhance shine and protect the hair. Ideal for smoothing unruly lengths, it delivers a polished, sleek finish without weighing the hair down.

  • Lightweight anti-frizz finishing serum
  • Enhances shine for a sleek, polished finish
  • Helps control flyaways and humidity-induced frizz
  • Protects and smooths the hair fibre
  • Ideal for finishing and maintaining sleek styles
Step 1
Shampoo Cleanse & prepare
Step 2
Mask Smooth & condition
Step 3
Treatment Transform & control
Step 4
Serum Finish & protect
Product Overview

This professional finishing serum helps smooth the hair surface, reduce frizz and deliver a high-shine finish. It leaves the hair feeling soft, controlled and polished without heaviness.

Key Features
  • Controls frizz and flyaways
  • Enhances shine for a mirror-like finish
  • Lightweight, non-greasy formula
  • Helps protect against humidity
  • Improves smoothness and manageability
How to Use
  • Apply a small amount to dry or towel-dried hair
  • Focus on mid-lengths and ends
  • Do not rinse
  • Style as desired
  • Use as a finishing step to control frizz and add shine
Ideal For
  • Frizz-prone or unruly hair
  • Enhancing shine and smoothness
  • Finishing sleek or polished styles
  • Maintaining control in humid conditions
Build Your Smoothing Routine

For best results, use as part of a complete smoothing routine:

  • Step 1: Cleanse with Keratin Alpha Sleek Shampoo
  • Step 2: Apply the Smoothing Mask
  • Step 3: Use Smooth Transformer Treatment
  • Step 4: Finish with Mirror Sleek Serum

This structured routine helps maintain sleek, controlled hair with enhanced shine and manageability.

View full details
1 10
View all

  • L'Oréal

    L’Oréal Professionnel Paris is one of the world’s most iconic professional hair... 

    L'Oréal

  • Wella

    Wella Professionals is a globally recognised salon haircare and colour brand with... 

    Wella

  • Leyton House

    Leyton House Professional is a globally respected salon hair colour and care... 

    Leyton House

  • Goldwell

    Goldwell is a globally respected professional haircare, colouring and styling brand with... 

    Goldwell

  • K18

    K18

1 5
View all