L'Oréal Professionnel Paris Keratin Alpha Sleek Hair Mask — 200ml salon-grade smoothing, deep nourishment & frizz control

L'Oréal Professionnel Keratin Alpha Sleek Hair Mask is a salon-grade treatment that intensely nourishes and smooths the hair fiber to reduce frizz and boost shine.

Designed for use at home or in professional settings, this rich mask blends Keratin-Alpha Shaper and amino-acid chains to target the hair surface and core. Its creamy, sensorial texture restores softness and hydration while reshaping keratin to deliver a sleeker finish. Alcohol-free and free of artificial colorants, it works on all hair types and fits into a weekly care routine for longer-lasting smoothness.

How does this mask reduce frizz and tame volume?

The formula works on two levels: it nourishes the fiber with amino-acid chains and reshapes keratin at the cuticle for a smoother surface. By smoothing the hair structure and sealing the outer layers, strands reflect more light and resist humidity better, translating into less frizz and reduced puffiness.

• Keratin-Alpha Shaper helps reorganize the hair’s keratin structure for a sleeker finish
• Amino-acid chains replenish and reinforce weakened areas inside the fiber
• Rich texture smooths and seals the cuticle to limit humidity absorption
• Tested results show substantial reductions in visible frizz and hair volume

When should I use the mask and how often?

For immediate softness and shine, apply the mask after shampooing, leave it on according to instructions, then rinse. For extended smoothing benefits, alternate this mask with the Keratin Alpha Sleek Smooth Transformer: use the transformer once weekly and the mask on the other wash days to maintain up to two weeks of controlled hair.

• Apply after cleansing on towel-dried hair
• Leave in for the recommended time for deep nourishment
• Rinse thoroughly and style as usual
• Alternate with Smooth Transformer for longer-lasting results

Is it suitable for my hair type and color-treated hair?

This mask is formulated to be compatible with all hair types, from fine to coarse and straight to curly. Because it’s free from alcohol and artificial colorants, it can be used on color-treated hair without stripping pigments, though always follow your colorist's guidance for best maintenance.

• Safe for natural, chemically treated, and color-treated hair
• Alcohol-free base helps preserve moisture balance
• Non-colorant formulation minimizes pigment interference
• Works on varying textures—adjust frequency as needed

What immediate effects will I notice after one use?

From the first application you should feel increased softness and see enhanced shine, with hair appearing smoother and easier to detangle. The mask deposits nourishing agents that instantly improve manageability and create a polished surface that reflects light more evenly.

• Instant softening and improved comb-through
• Noticeable increase in shine and smoothness
• Reduced static and fewer flyaways after styling
• Prepares hair for longer-lasting frizz control when used in the routine

Who is this for? L'Oréal Professionnel Keratin Alpha Sleek Hair Mask is aimed at anyone seeking salon-level smoothing and nourishment at home: people with frizz-prone or voluminous hair, those who want more shine and manageability, and clients who follow professional keratin-based routines. It’s also a practical choice for color-treated hair owners and busy users who prefer a powerful, easy-to-use treatment that integrates into weekly care.