Will the Keratin Alpha Sleek Mirror Sleek Serum weigh my hair down or make it greasy?

Not at all! The Keratin Alpha Sleek Mirror Sleek Serum is lightweight and alcohol-free, so it won’t leave your hair feeling heavy or oily. It's designed for frizzy, dry, or thick hair, but even fine or medium hair stays light and bouncy when you use just a few sprays as directed. Simply shake, spray on damp hair, focus mid-length to ends, and enjoy smooth, shiny results without any residue.

How does this serum help with frizz and heat protection?

This serum uses 5% Keratin Sealer technology to target frizz and shield your hair from humidity and heat up to 230°C. That means less puffiness, more shine, and hair that's easier to style. If you often blow-dry or straighten your hair, making this serum part of your routine helps prevent heat damage and keeps your hairstyle sleek for up to five days.

Can I use the Keratin Alpha Serum every day, and what’s the best way to apply it?

Yes, you can use the Keratin Alpha Serum each time you wash and style your hair. For best results, shake the bottle and spray 2–4 times on damp hair if you have fine or medium hair, or 6–8 times for thick hair. Distribute evenly from mid-lengths to ends—avoid the roots for a natural look. Don’t rinse out. Blow-drying or straightening after application activates the anti-frizz and heat protection benefits, leaving your hair smooth, shiny, and protected.

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Allure Hair Supplies

Keratin Alpha Sleek Mirror Sleek Serum 50ml – Anti-Frizz Heat Protection Hair Serum

£18.00 ex.vat

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Get sleek, glossy hair with the keratin alpha serum: Keratin Alpha Sleek Mirror Sleek Serum 50ml by L'Oréal Professionnel.

This professional anti-frizz hair serum uses 5% Keratin Sealer technology to smooth, protect, and boost shine.

It also helps defend hair against humidity and heat styling damage.

Key Benefits

Instant mirror-like shine lasting up to 5 days*

Helps control frizz and unwanted volume for a polished finish

Heat protection up to 230°C (450°F)

Fights up to 80% humidity*

Reduces styling time by up to 50% with full routine use

Heat-activated formula for enhanced performance

Alcohol-free & artificial colourant-free

Lightweight, non-greasy finish that won’t weigh hair down

Why This Serum Works

Looking for the best anti-frizz serum with heat protection in the UK?

This salon-grade formula helps create smooth, polished hair with long-lasting shine.

It supports manageability and frizz control, even in humid conditions.

Use it as a heat protection serum before blow-drying or straightening.

The result is faster, easier styling and a professional finish.

Advanced Formula

Keratin Sealer 5% Complex – seals and smooths the hair fibre

Locks in sleekness and enhances shine for a mirror-like look

Helps maintain results from your full smoothing routine

Ideal when you want frizz control without a heavy feel

Note: This product does not contain keratin but works on the hair’s keratin structure.

How to Use

Shake well before use

Apply to towel-dried hair

Use this serum before heat styling for best performance

Use:

2–4 sprays for fine to medium hair

6–8 sprays for thicker hair

Distribute evenly from mid-lengths to ends

Do not rinse

Blow-dry and use straighteners to activate

Proven Results

Shine lasting up to 5 days*

Up to 80% humidity protection*

Faster styling with full routine use

Enhanced smoothness and frizz control

*Based on instrumental and consumer testing

Ideal For

Frizzy, dry, or dull hair

Heat styling users (straighteners, blow-dry)

Thick, coarse, or high-volume hair

Anyone wanting sleek, glossy, salon-finish hair

Product Details: keratin alpha serum

Size: 50ml

Brand: L'Oréal Professionnel

Range: Serie Expert

Type: Anti-Frizz Heat Protection Serum

Add this serum to your routine for shine, smoothing, and heat-ready styling.

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Keratin Alpha Sleek Mirror Sleek Serum 50ml – Anti-Frizz Heat Protection Hair Serum