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L'Oréal Professionnel

Keratin Alpha Sleek Anti-Frizz Hair Serum for Hair Shine

4.4 · 189 reviews
4,036 ₽

What it is: A heat-activated leave-in serum that seals the hair’s structure for up to 10 washes of smoothness, frizz control, and humidity protection.Hair Texture: Straight, Wavy, Curly, and CoilyHair Type: Fine, Medium, and ThickHair Concerns:- Frizz- Shine- VolumizingKey Benefits: - Provides long-lasting smoothness and controls frizz- Protects against heat and humidity- Repels water and delivers mirror sleek shineHighlighted Ingredients:- Keratin Sealer 5%: Powerful complex that seals the hair’s keratin structure for smooth results.Ingredient Callouts: It is vegan.What Else You Need to Know: This professional leave-in serum is your key to long-lasting, salon-quality smoothness. It is free from alcohol and artificial colorants and suitable for all hair types.Fragrance Description: A fresh and modern floral fragrance with powdery notes of cardamom and ginger, balanced by a warm, musky base of sandalwood and vetiver.Clinical Results: In an instrumental test: - Provided frizz and volume control for up to 10 washes- Protected against humidity up to 80% - Protected against heat up to 450°F

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What it is: A heat-activated leave-in serum that seals the hair’s structure for up to 10 washes of smoothness, frizz control, and humidity protection.Hair Texture: Straight, Wavy, Curly, and CoilyHair Type: Fine, Medium, and ThickHair Concerns:- Frizz- Shine- VolumizingKey Benefits: - Provides long-lasting smoothness and controls frizz- Protects against heat and humidity- Repels water and delivers mirror sleek shineHighlighted Ingredients:- Keratin Sealer 5%: Powerful complex that seals the hair’s keratin structure for smooth results.Ingredient Callouts: It is vegan.What Else You Need to Know: This professional leave-in serum is your key to long-lasting, salon-quality smoothness. It is free from alcohol and artificial colorants and suitable for all hair types.Fragrance Description: A fresh and modern floral fragrance with powdery notes of cardamom and ginger, balanced by a warm, musky base of sandalwood and vetiver.Clinical Results: In an instrumental test: - Provided frizz and volume control for up to 10 washes- Protected against humidity up to 80% - Protected against heat up to 450°F

Customer reviews

4.0
verified purchase
My hairdresser put me on

Omg y’all I cannot get my hair sleek. I have thick and dense hair that’s like sorta coily underneath? I live in GA weather/humidity. My hair dresser did this and blew my hair out. UnMATCHED.

9/5/2026
1.0
verified purchase
Does not worth price

Does not work! After blow out my hair was good but after the first wind the frizz show up

8/6/2026
4.0
verified purchase
Just a Scoch

I received the Keratin Hair Serum for Shine to test out and overall I really like it! It definitely adds shine and helps smooth down my flyaways without making my hair feel crunchy or stiff. That said, a little goes a LONG way with this stuff. The first time I used it I was a little heavy handed and my hair ended up looking way more greasy than shiny 😂. After figuring out the right amount, though, I loved the results. Just a small pump worked great on my hair and left it looking smooth, healthy, and glossy. If you use it sparingly, it’s a great finishing product and makes your hair look like you just left the salon.

6/20/2026
4.0
verified purchase

Leaves the hair super soft and shiny. I got it specifically for a trip to the beach and the humidity, but I haven’t had the chance to test the anti-frizz.

5/31/2026
3.0
verified purchase
Stinks

Great product. Smells absolutely terrible. Like burnt hair.

5/20/2026
5.0
verified purchase
So soft

After using this product for the past few weeks I can honestly say I love it! It makes my hair feel so soft and it smooths out all the fly aways! I would definitely repurchase this.

5/20/2026
2.0
verified purchase
Good product; awful smell

My hairdresser used this product on me and I purchased from Sephora. The smell is awful. Didn’t notice it as much in the salon. Good product; awful smell.

5/14/2026
2.0
verified purchase
smells funky

The cere is good. The only thing I would change is the smell. Mine had like a fishy kind of smell, which did not like at all. I was scared to even put it on when I was going to go out, but I did try it without going out and styling it and it was amazing just that the smell was not my favorite.

5/8/2026
4.0
verified purchase

It smells nasty but this stuff WORKS!!! My hair feels so good.

8/4/2026
5.0
verified purchase
Frizzy hair routine must have

Easiest 5 stars I’ve ever given a product! My hair is so shiny and smooth even after washing (product is supposed to last 10 washes). If you’re constantly fighting frizz like I am then I highly recommend that you try this serum.

7/22/2026