L'Oréal Professionnel Keratin Alpha Sleek Professional Mirror-Smooth Serum 50 ml
50 ml Bottle-spray
Price per kg/L: $428.00
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From 23rd September 2026
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Description
Directions for use
Composition
Details
Description
L'Oréal Professionnel Keratin Alpha Sleek Professional Mirror-Smooth Serum 50 ml is formulated with 5 % Keratin Sealer, an active ingredient designed to help seal the hair's keratin.
It helps provide a long-lasting smoothing effect while helping to control frizz and volume for up to 10 washes.
It also forms a protective barrier against humidity, even in conditions up to 80 % air humidity, helping to maintain hair discipline and softness.
With heat protection up to 230 °C, it protects hair when using heating devices such as blow-dryers, flat irons, or curling wands.
Integrated into a hair routine, it provides up to 2 weeks of anti-frizz effect and softness, while making daily styling up to 3 times faster.
Directions for use
Shake well before use.
Detangle hair, towel-dry, and divide into 4 sections.
Apply 2 to 3 pumps per section.
Comb through to distribute evenly from lengths to ends.
Blow-dry hair.
Use a flat iron for long-lasting results.
In case of contact with eyes, rinse thoroughly with water.
Store in a cool, dry place.
Fragrance evolution over time is normal and does not affect product efficacy.
Composition
Details
| EAN Code | 3474637335618 |
| Form | Serum |
| Presentation | Bottle-spray |
| Contents | 50 ml |
Latest reviews of this item
L'Oréal Professionnel Keratin Alpha Sleek Professional Mirror-Smooth Serum 50 ml
L'Oréal Professionnel Keratin Alpha Sleek Professional Mirror-Smooth Serum 50 ml is rated
out of
5 by
45.
Rated 5 out of
5
by
CharlotteD from
Smooth and sleek
[This review was collected as part of a promotion.] Ive recently used the L'Oréal Keratin Alpha Sleek Serum 50ml and I have to say I am really impressed with the results. From the first uses, I noticed a clear difference in the improvement of my hair, as it appears and feels much softer and sleeker.
Having afro hair, frizz has always been an issue for me, but after using this serum I have noticed a big difference especially in more humid weather.
My hair feels much more controlled throughout the day, but doesn't feel heavy or greasy and it's great that it lasts up to 10 weeks, however, I did reapply sooner to get the same effects. It also helps control volume perfectly, as my hair appears polished and styled, rather than puffy and frizzy.
Despite applying sooner, what I love most is the long lasting effects. With my hair care routine, I usually have to apply lots of products to try and reduce the frizz, however, with this product I have been able to use less products which means less chemicals on my hair, which can often make my hair feel cakey and greasy.
After numerous uses, I would definitely recommend the serum and I will definitely be repurchasing again. I have already recommended it to family and friends, especially my curly hair girls.
Date published: 2026-04-07
Rated 3 out of
5
by
LindsayF from
Use a small amount
[This review was collected as part of a promotion.] I found this L’Oréal serum to leave my hair sticky and unmanageable. So after trying it and using a lot less it was slightly less sticky and kept my hair straight and manageable for longer than normal. I had shine and lot less frizz than usual .
Date published: 2026-03-27
Rated 4 out of
5
by
MeganJ from
Great product for taming frizz and getting that sl
[This review was collected as part of a promotion.] Smooth, frizz free hair for up to 2 weeks with a lasting shine. Great for taming unruly hair and boosting manageability.
The spray aspect of the bottle is great as it’s mess free and the application couldn’t have been easier.
I have quite long hair at the moment and I used around 8-10 sprays. So this bottle will last quite a while
Date published: 2026-03-27
Rated 4 out of
5
by
NayhaaS from
Good but don’t like the smell
[This review was collected as part of a promotion.] I like how it works and it does truly smooth my hair but I’m not a big fan of the smell. It smells really strong and similar to bleach. Other than that it is good. I like the packaging too.
Date published: 2026-03-26
Rated 5 out of
5
by
CathyS from
Five days straight smooth hair ❤️
[This review was collected as part of a promotion.] L'Oréal professional keratin Alpha Sleek serum is a leave in serum for smooth, frizz free hair. Reprograms the hair for long lasting frizz control. Glass shine and easier styling in half the time. The serum seals the hairs keratin structure for up to 5 days straight smooth hair. Fights against 80% humidity and doubles up as a heat protectant too! The serum is heat activated with either a hair dryer or a straightener for long lasting results. Just divide the hair into sections, spray the serum into your hands and glide through sections until hair is coated before heat styling for best results. I used a straightener and I can definitely see a huge difference. My hair felt significantly smoother, easier to style and did last days before I needed a wash day! I love that the serum is colourant and alcohol free. Easier manageable glossy hair, an amazing serum ❤️
Date published: 2026-03-24
Rated 5 out of
5
by
IsabelliT from
perfect for a straight look with no frizz
[This review was collected as part of a promotion.] great serum and works best with heat for a glossy look. Worth it’s value as a little goes a long way. Makes your hair smell light and salon-fresh.
Apply to damp hair, don’t rinse, and style with heat.
Date published: 2026-03-23
Rated 5 out of
5
by
LeahR from
Easy to use
[This review was collected as part of a promotion.] Such an easy product to use, simply wash my hair and then spray onto it after. No harsh smells, good sized bottle, pretty purple colour so looks very nice. Heat activated so tends to work when using the hairdryer after washing.
Date published: 2026-03-09
Rated 5 out of
5
by
AlisonS from
Perfect hair care for a busy mum! So easy to use!
[This review was collected as part of a promotion.] I recently tried L'Oréal Professional Paris Keratin Alpha Sleek treatment and I'm honestly so impressed with the results. My hair feels incredibly shiny and smooth even after 3 days of using it. Usually my hair starts to lose that fresh Sleek look after a day but this has really lasted.
One thing I really love about it is there's no greasy heavy feeling my hair still feels light and clean. I'm just more polished. The product is super easy to use which is always a plus as I don't always have time for complicated hair routines as a busy mum. Another huge difference for me is the frizz control. It's great.
Date published: 2026-03-08
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