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Keratin Alpha Sleek Smooth Transformer

Keratin Alpha Sleek Smooth Transformer is rated 4.5 out of 5 by 66.
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6.76 oz.
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What It Is

A professional-grade, semi-permanent smoothing treatment mask that transforms hair for up two weeks of unparalleled smoothness, shine, and frizz control.

What It Does

• Smooths and controls frizz for up to 2 weeks.*

• 6x smoother hair**

• 77% more shine***

• Long-lasting frizz & volume control

• Faster smooth styling****

• Suitable for all hair types, even color or keratin-treated

 

*after 4 weekly uses of Smooth Transformer

**Smooth Transformer vs. before application

***vs. unwashed hair

**** vs. non-conditioning shampoo when using flat iron

What Else You Need to Know

This professional smoothing treatment is formulated with Keratin-Alpha Shaper and amino-acid chains to deliver salon-quality results. This is a breakthrough hybrid of texture and hair care. Contrary to classic conditioners or masks, it deeply penetrates inside the fiber and smoothes the hair at the keratin alpha level, the deepest level of hair. It is free from alcohol and artificial colorants, and suitable for all hair types including keratin-and color-treated. It is safe to use during a color appointment.

 

Note: This product has a technical smell due to a small amount of cysteine in the formula, which supports the anti-frizz, smoothing benefit.

1. Progessive treatment, use once a week after shampooing. Alternate with a hair mask on other wash days.

2. Shake the bottle well before use.

3. Section hair into two parts and apply evenly from lengths to ends on each section. Use 1 - 1.75 ounces, depending on hair thickness and length.

4. Leave on for 10–15 minutes, and then rinse thoroughly.

5. To activate the smoothing technology, blow-dry completely and use a flat iron. Use weekly for 4 uses, then once a month to sustain the frizz-control. Stop using if the hair feels dry.

AQUA / WATER / EAU • CETEARYL ALCOHOL • COCOS NUCIFERA OIL / COCONUT OIL • BEHENTRIMONIUM CHLORIDE • ISONONYL ISONONANOATE • CETYL ESTERS • PARFUM / FRAGRANCE • ETHANOLAMINE • ISOPROPYL ALCOHOL • CYSTEINE • DIMETHICONE • HYDROXYETHYLCELLULOSE • PHENOXYETHANOL • SODIUM METABISULFITE • AMODIMETHICONE • ASCORBIC ACID • TRIDECETH-10 • TRISODIUM ETHYLENEDIAMINE DISUCCINATE • PEG-100 STEARATE • ROSE KETONES • STEARETH-6 • TAURINE • TRIDECETH-3 • GLYCERIN • BUTYLENE GLYCOL • DISODIUM PHOSPHATE • ACETIC ACID • POLYSORBATE 60 • SODIUM PHOSPHATE • CARBOMER • SODIUM LACTATE • POLYSORBATE 20 • PALMITOYL TRIPEPTIDE-1 • PALMITOYL TETRAPEPTIDE-7

Purchases made in SalonCentric stores may be returned to any SalonCentric store. Purchases made through SalonCentric Customer Service, SalonCentric Business Partners, and SalonCentric.com orders Sold and Shipped by SalonCentric may be returned to a SalonCentric store; however, the return must not exceed $450 and must include the original receipt, packing slip, or invoice. For returns in-store of online orders, the refund will be credited back to the original payment method once the return has been processed. For SalonCentric.com Online Exclusive orders sold and shipped by third-party sellers, please see more details linked below for return steps.

The SalonCentric return policy does not currently apply to Kérastase & Shu Uemura purchases. Kérastase & Shu Uemura do not accept returns.

Click to see more details.

Rated 4 out of 5 by from Great! This unique transformer or aka hair mask is such a game changer for frizzy thick and coarse hair! Works wonders at smoothing the cuticle and making the hair feel so soft.
Date published: 2026-06-19
Rated 4 out of 5 by from Good treatment, bad smell The system as a whole does leave the hair pretty soft and smooth. I like the idea of the set and it all seems to work well, my only complaint is the treatment smells soooo bad, and it does linger in the hair a bit. The client I used it on didn't seem to mind it, but when I tried it on myself I definitely did mind. I'm not sure if the smell would prevent me from using it in the future. The product does work well.
Date published: 2026-06-19
Rated 5 out of 5 by from Great transformation Works very well on smoothing the hair and maintaining. The only bad part is the smell being stronger.
Date published: 2026-06-18
Rated 5 out of 5 by from Love. Works amazing with the system. My hair has never felt better.
Date published: 2026-06-18
Rated 5 out of 5 by from Great new product I’ve tried it on my hair first! I never had a smoother blowout! I’m obsessed! Recommending it to all my frizzy hair clients!
Date published: 2026-06-18
Rated 5 out of 5 by from Really does the work Very shiny and soft hair. It has a bit of a different smell from the others
Date published: 2026-06-17
Rated 4 out of 5 by from Great immediate results Thank you to BzzAgent and Saloncentric for the opportunity to participate in using this product line in exchange for my honest review! I used this a handful years f times over the last few weeks, and my favorite thing about it is the immediate smoothing and silky feeling after applying it in the shower. If I had to provide anything I didn't care for, it would have been the scent. I felt it almost had a "beer" scent while using and after it is rinsed. Other then that, this definitely delivered!
Date published: 2026-06-16
Rated 4 out of 5 by from The Line as a Whole is Impressive Thank you L'Oreal for allowing me to sample the Keratin Alpha Sleek Smooth Transformer in exchange for my honest review! The Alpha Sleek Smooth Transformer does smooth and transform frizzy, dry hair into silky smooth locks! There is a slight scent that reminds me of relaxers from the 80's and 90's area. The frizz control only lasted until the next wash. Heat styling/application should be utilized, blow dry with a flat brush and tautness for a sleek finish.
Date published: 2026-06-15
Rated 4 out of 5 by from Frizz free hair This product really does work to leave your hair, smooth and shiny and free from frizz It does have a bit of a strong scent, kind of like a diluted perm solution I felt the smell went away after your hair dries I have used the whole system shampoo, mask, and the serum and it really has help with my frizzy hair
Date published: 2026-06-13
Rated 4 out of 5 by from Smells like perm I received this product from BzzAgent to review. This was prob my least favorite. Scent went from pleasant (compared to strong floral shampoo) to chemical PERM real quick. I left on for 15 min as directed. I used with as a system with alpha sleek shampoo and client didn't mind the scent and hair was noticeably smooth with less frizz.. but IMO scent was very off putting.
Date published: 2026-06-13
Rated 4 out of 5 by from Effective but stinky My initial reaction to this product was that the smell caught me off guard it reminded me a little of perm solution 😅 Since the treatment stays on the hair for 15 minutes, it was definitely noticeable at first. But once I looked past the scent, I was actually really impressed with the results. I have very coarse, frizzy, 2C textured hair, and noticed an improvement almost immediately compared to the products I normally use. My hair felt noticeably softer, smoother, and shinier, and even by day 4 I was waking up with significantly less frizz. The results honestly outweighed the smell for me I loved it!
Date published: 2026-06-13
Rated 5 out of 5 by from Exceptional. obsessed with this! If you use it properly following the step by step instructions, it will literally transform your hair from frizzy to sleek.
Date published: 2026-06-12
Rated 5 out of 5 by from Shiney and smooth This worked amazing! It really did help calm frizz and smooth the hair! It added amazing shine!
Date published: 2026-06-12
Rated 5 out of 5 by from Helps Keep My Hair Smooth I've been using Keratin Alpha Sleek Smooth Transformer before styling, and it helps keep my hair looking smoother and more controlled throughout the day. It cuts down on frizz and flyaways without making my hair feel sticky. My hair feels softer and looks more polished after using it.
Date published: 2026-06-11
Rated 3 out of 5 by from Pointless if not using heat Honestly, the Smooth Transformer is just the once-a-week goo you actually need if you want the Sleek line to do anything. You shampoo, slap it on for like 10-15 minutes, rinse, then you have to blow-dry and flat iron it or it doesn't really kick in. It keeps hair smooth, shiny, and not frizzy for a couple weeks, and it chills the puff so styling takes less time, but it's kinda pointless if you're not into heat.
Date published: 2026-06-10
Rated 4 out of 5 by from Decent Works really well but it's very stinky while in the hair. No matter what I did afterwards, the smell stuck around.
Date published: 2026-06-09
Rated 5 out of 5 by from Yes 100! Loveeeee this product! I really feel like my hair cuticle was smooth and my hair had less frizz. The smell isn’t as overpowering as the rest of the products.
Date published: 2026-06-09
Rated 5 out of 5 by from Whole system works well together This is a pretty good appraise, especially if you get it on sale. You could offer it as a mini Brazilian blowout treatment, obviously not as good but much faster and cheaper!
Date published: 2026-06-09
Rated 4 out of 5 by from working worked better than i expected. helped reduce volume and frizz. definitely a good system
Date published: 2026-06-09
Rated 3 out of 5 by from Just ok Helped with smoothing and humidity resistance. I didn’t like the amount of time necessary for the product to sit. The whole line has an off smell to me. Would not purchase
Date published: 2026-06-09
Rated 5 out of 5 by from Overall good product After using it a few times I do notice a difference! It does help keep the shine and maintain frizz and curls.
Date published: 2026-06-08
Rated 5 out of 5 by from Wonderful! I love this system so much. Great for the coarse unruly hair. Wish the scent wasn’t as strong though
Date published: 2026-06-08
Rated 5 out of 5 by from Pleasant surprise I've been using this system for a few weeks now and I can honestly say my hair feels sleeker and more manageable. I live in a high humidity area and I can tell a difference in the smoothness of my hair after being outside. I also love the scent of these products!
Date published: 2026-06-08
Rated 5 out of 5 by from Sleek System! Awesome Smooth transformer to go with the Keratin alpha sleek anti- Frizz collection! Works well in conjunction with the rest of the system. Being someone who has frizz prone hair this is definitely a keeper! I did receive this product in exchange for my professional and honest review.
Date published: 2026-06-08
Rated 5 out of 5 by from Silky Smooth This product is magic in a bottle. Leaves my hair silky smooth after my blow dry.
Date published: 2026-06-08
Rated 4 out of 5 by from Good for at home It works well for a product that is for smoothing and not being an actual service. I will say however that since it has to sit for 15min I would rather just do a treatment so it would last longer. But for those who do not want to spend that money it would be a good product for them
Date published: 2026-06-08
Rated 5 out of 5 by from great smoothing treatment used this on a client who has super frizzy, undefined curls. just after the blowout, her hair was SILKY! i followed with loose iron waves and the hair felt so nice and "sealed". I also used the sleek serum which is a must have.
Date published: 2026-06-08
Rated 4 out of 5 by from Frizz control I used this as a system. The shampoo is great nice lather decent smell. The conditioner is creamy yet lightweight and definitely leaves the hair smoother. The masque is heavier and ferls more like a deep conditioning service. The serum was probably my least favorite. It left my hair feeling slightly coated but still smooth. I have finer hair and thicker hair may not experience the same coated feeling. Overall its a great line and if uou live in a humid area it is great for frizz control
Date published: 2026-06-07
Rated 5 out of 5 by from Transforms! This deeper conditioning treatment works great at helping the hair be more smooth, cut out static and frizz. Works best with the alpha sleek shampoo— but would be a great addition as a deep conditioner to any hair regime!
Date published: 2026-06-02
Rated 5 out of 5 by from Transforms hair to smooth and shiny The Keratin Smooth transformer actually smooths hair for two weeks. Hair feels less frizzy and healthy after use. The whole product line is amazing.
Date published: 2026-06-02
  • y_2026, m_7, d_28, h_9
  • bvseo_bulk, prod_bvrr, vn_bulk_3.0.48
  • cp_2, bvpage2n
  • co_hasreviews, tv_6, tr_60
  • loc_en_US, sid_loreal-professionnel-keratin-alpha-sleek-smooth-transformer, prod, sort_[SortEntry(order=SUBMISSION_TIME, direction=DESCENDING)]
  • clientName_saloncentric
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  • reviews, product