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Keratin Alpha Sleek Mirror Sleek Serum

Keratin Alpha Sleek Mirror Sleek Serum is rated 4.7 out of 5 by 46.
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1.69 oz.
#E4564700
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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.

What It Does

• Seals hair outer keratin structure for up to 10 washes*

• Anti-humidity up to 80% humidity in the air

• Heat protection up to 230C (450F)

• 6x smoother hair**

 

*leave-in serum vs. untreated hair

** system of shampoo, smooth transformer, and leave-on vs. before application

What Else You Need to Know

Formulated with 5% Keratin Sealer, this serum seals the hair structure for smoothness, frizz, and volume control that lasts up to 10 washes.

1. Shake well before use.

2. On washed, towel-dried hair, section hair into two parts.

3. Spray into your hand (start with 2–4 sprays for thin hair, 6–8 for thick hair) and distribute evenly from lengths to ends.

4. Do not rinse.

5. This product is heat-activated. Blow-dry completely.

6. For maximum long-lasting results, use a straightening iron after blow-drying.

DIMETHICONE • BIS-(MORPHOLINOMETHYL C1-4 DIALKOXYSILOXY) DIMETHICONE • BIS-CETEARYL AMODIMETHICONE • PARFUM / FRAGRANCE • LINALOOL • CITRONELLOL • GERANIOL

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 5 out of 5 by from Love it Good serum that isn’t too heavy and smells yummy. Is light but still leaves hair shiny and protects from heat. Must buy!
Date published: 2026-05-23
Rated 5 out of 5 by from Five ⭐️⭐️⭐️⭐️⭐️ I’ve tried a lot of smoothing serums over the years, and this one stood out because it added shine without leaving the hair greasy or sticky. I used it to finish a few blowouts in the salon and it gave the hair a really sleek, polished look while helping calm frizz and flyaways. The texture feels lightweight, so it worked well even on finer hair without weighing it down. I also noticed it helped keep the style looking smooth longer throughout the day, especially in humidity. A little goes a long way, and the overall finish looked healthy and glossy instead of overly coated. I received this product free for my honest review.
Date published: 2026-05-21
Rated 5 out of 5 by from easy to use heat protection easy to use and made my hair silky soft. great to keep hair from heat damage. sprayed it on before styling and my hair was sleek and beautiful. no stickiness or greasy look , just nourished and bouncy and shine!!
Date published: 2026-05-19
Rated 5 out of 5 by from 10/10 product! I love this serum! I used only this product on a client to see its full effect. The hair was saturated with the serum, and then blown dry and flat ironed at about 360•. The usual frizz that lingers with other products was GONE. The hair was sleek with a beautiful shine. I have a feeling this is going to be my new favorite with my frizzy or keratin treated clients. I received this product at no charge in exchange for my honest review.
Date published: 2026-05-18
Rated 5 out of 5 by from L’Oréal ProfessionnelKeratin Alpha Sleek Night S A little goes a long way with this one. It’s lightweight, absorbs quickly, and doesn’t leave hair greasy or sticky overnight. By morning, my hair felt softer, calmer, and noticeably less frizzy. It’s especially amazing on dry ends and for maintaining sleek styles between wash days. Bonus points because it makes hair smell incredible.
Date published: 2026-05-18
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