L'Oréal Serie Expert Keratin Alpha Sleek Serum 50ml

Keratin Alpha Sleek Mirror Sleek Serum by L'Oréal Professionnel, formulated with Keratin Sealer 5%. The Mirror Sleek serum seals the hair’s keratin structure to control unwanted volume and deliver instant shine that lasts up to 5 days¹. When used with the full routine, it will reprogram hair for up to 2 weeks of frizz control². The serum helps to fight against up to 80% humidity³ with heat protection up to 230°C (450°F)⁴, controlling unwanted volume for daily styling in half the time⁵.

Heat-activated. Dry with hair dryer. Use straightening iron for longer lasting results. This serum is artificial colorant free, and alcohol free.

¹Instrumental test after 1 application of shampoo, mask & serum.

² Consumer test on 68 participants, 1 application/week for 4 weeks. Based on a 15-day break observation.

³Instrumental tests, with full routine after 4 uses of the Smooth Transformer.

⁴Instrumental tests. 

⁵Instrumental tests with routine 4 times of Shampoo + Smooth Transformer + Leave-on.

Note: Keratin is an animal-derived ingredient, also found in human hair. This product does not contain Keratin.