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Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment
Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment

L'Oréal Professionnel Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment 250ml

%0 4.79 | 57 reviews
+Offer
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£32.00 (£0.13 per ml)

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L'Oréal ProfessionnelKeratin Alpha Sleek Hair Mask Anti Frizz & Smoothing Hair Treatment
£32.00
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L'Oréal Professionnel Keratin Alpha Sleek Hair Mask Anti Frizz & Smoothing, nourishing conditioner hair treatment 250ml

Reprograms hair for up to 2 weeks of frizz control1
•\tUp to 5x smoother hair and 2x less frizz2
•\tControls unwanted volume for daily styling in half the time3

A professional hair mask treatment with a rich, sensorial texture that deeply nourishes, hydrates & conditions hair while reshaping and smoothing hair keratin.
•\tProvides up to 3x less unwanted volume ⁴
•\tHelps protect hair from hair breakage and improves softness from the first use5
•\tDelivers instant shine that lasts up to 5 days5

For instantly smoother hair, use this hair mask. For long-lasting reprogramming use Smooth Transformer once a week, and use this mask on other wash days of the week. Apply evenly from lengths to tips. Leave on for 5 minutes and rinse.

1Consumer test on 68 participants, 1 application/week for 4 weeks. Based on 15-day break observation. 2Instrumental test after 4 uses of Smooth Transformer. 3Instrumental tests with 4 uses of the Shampoo + Smooth Transformer + Serum routine. ⁴Instrumental test. 5Instrumental test after 1 application of shampoo, mask & serum.

Directions

For instantly smoother hair, use this mask. Use after Keratin Alpha Sleek Professional Shampoo, apply evenly from lengths to tips. Leave in for 5 minutes and rinse.

Ingredients

1261084 A - INGREDIENTS: AQUA / WATER / EAU • CETEARYL ALCOHOL • BEHENTRIMONIUM CHLORIDE • CITRIC ACID • CETYL ESTERS • GLYCERIN • GLYCINE • ISOPROPYL ALCOHOL • AMINOPROPYL DIMETHICONE • POTASSIUM HYDROXIDE • ISODODECANE • PHENOXYETHANOL • BIS(C13-15 ALKOXY) PG-AMODIMETHICONE • BUTYROSPERMUM PARKII BUTTER / SHEA BUTTER • STEARETH-100 • PROPYLENE GLYCOL • HYDROXYPROPYL GUAR • PEG-150/DECYL ALCOHOL/SMDI COPOLYMER • TETRAMETHYL ACETYLOCTAHYDRONAPHTHALENES • POLYQUATERNIUM-37 • LINALYL ACETATE • PROPYLENE GLYCOL DICAPRYLATE/DICAPRATE • CHLORHEXIDINE DIGLUCONATE • CARVONE • CITRUS LIMON PEEL OIL • LIMONENE • COUMARIN • LINALOOL • CITRUS AURANTIUM BERGAMIA PEEL OIL • BUTYLENE GLYCOL • PPG-1 TRIDECETH-6 • PINENE • ACRYLATES/STEARYL METHACRYLATE COPOLYMER • SORBITAN OLEATE • CARBOMER • SODIUM LACTATE • TAURINE • POLYSORBATE 20 • EDTA • PALMITOYL TRIPEPTIDE-1 • PALMITOYL TETRAPEPTIDE-7 • PARFUM / FRAGRANCE (F.I.L. N70061785/1).

This list of ingredients may be subject to change, please consult the packaging of the product purchased.

Bundle

25% SAVING. When you buy two qualifying L'Oréal Professionnel products.*

*Simply add two qualifying L'Oréal Professionnel products fulfilled by SEPHORA UK to your Shopping Bag and the discount will automatically apply at checkout. One offer bundle per order. Valid until the 13th July or whilst stock lasts. Cannot be used in conjunction with any other promotional discount. Offer is not applicable to pending purchases or previously made purchases.

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25% SAVING. When you buy two qualifying L'Oréal Professionnel products.*
Free Gift

FREE Absolut Repair Molecular Mini Rinse-off Serum 75ml when you spend £38 on L'oreal Professionel.*

*One free gift per order. Valid until the 13th of July or whilst stock lasts. Your free gift will automatically add to the shopping bag page. Total at order summary must be £38 or more worth of L'oreal Professionel products, after any Promotion Code, Brands You Love discount and before delivery charges are applied. Cannot be used in conjunction with any other Promotion and this offer is not applicable to previously made or pending purchases. 

Shop this offer

FREE Absolut Repair Molecular Mini Rinse-off Serum 75ml when you spend £38 on L'oreal Professionel.*
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Rated 5 out of 5 by from Hydrating Out of all the products from this line I prefer this one the most, it’s hydrating, doesn’t smell too bad compared to the rest of the line and keeps my hair soft.
Date published: 2026-06-21
Rated 5 out of 5 by from Nourished smoother hair [This review was collected as part of a promotion.] My hair has been pretty dry and lack lustre recently. This has been helping to put the hydration back into my hair strands reducing the frizziness greatly. This has deeply nourished my hair my hair.testure is smoother and shinier.
Date published: 2026-06-08
Rated 5 out of 5 by from Light weight and nourishing [This review was collected as part of a promotion.] Having basically finished this product, clearly I love it. Pairs really well with the metal detox shampoo and is great for when you’re in the bath or having an everything shower and can leave it on longer than normal conditioner. Leaves hair soft, nourished and no residue or heavy weight left for my fine hair! Nice but very mild scent.
Date published: 2026-05-22
Rated 5 out of 5 by from You will see change just after first use! ✨❤️ [This review was collected as part of a promotion.] I’v been using this hair mask for about 2,5 weeks. Difference is honestly amazing! My hairs feels deeply nourished and the texture is so much better ✨ Just like you can see on my photos 😁❤️ Oh and scent? Absolutely gorgeous I didn’t expect such amazing results, just ordered another one! If your hairs needs repair don’t go.. run for this product!
Date published: 2026-03-27
Rated 5 out of 5 by from Soft and glowy hair [This review was collected as part of a promotion.] Love this product, my hair feels super soft and smells beautiful. My hair is looking glowy and healthy, less frizzy. This mask is worth every penny.
Date published: 2026-03-26
Rated 5 out of 5 by from Shiny, healthy hair [This review was collected as part of a promotion.] I received a sample size of this product limo tha ago and wondered how it would do using it long term. I am not surprised at the results.My hair is super soft, looks healthy and has a mirror shine. I have less hair fall and it smells absolutely amazing. My hair don’t break when I brush it, anymore and there is new hair growth. Easy to use, wash your hair, apply the product from ends and work your way up. Make sure to not put too much of the product on the roots. Leave for 5 minutes et voilà! I think it’s great value as you won’t be using it every single hair wash day. I use mine once a week and it does an amazing job.
Date published: 2026-03-23
Rated 5 out of 5 by from Smooth, Soft Hair Every Time [This review was collected as part of a promotion.] This hair mask makes such noticeable difference after just one use. My hair feels softer, looks shiner, and is way less frizzy without feeling heavy or greasy. The texture is rich but easy to work through, and it rinses out clean without leaving any residue. It really gives that sleek, salon-like finish at home, which I love . Perfect for anyone dealing with dry or unruly hair, definitely one I’ll keep buying.
Date published: 2026-03-19
Rated 5 out of 5 by from Excellent [This review was collected as part of a promotion.] This mask smells amazing. I had excellent results with it. And it lasts a long time. Applying this product to the hair has an incredible feel. The results it gave my hair was highly effective. This mask is worth every pound. It’s a great value.
Date published: 2026-03-19
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