L'Oréal Professionnel Paris Keratin Alpha Sleek Hair Mask — Deep Nourish & Frizz Control, Alcohol-Free

L'Oréal Professionnel Keratin Alpha Sleek Professional Hair Mask is a salon-grade treatment designed to deeply nourish hair, smooth the keratin fiber, and reduce frizz and volume for a sleeker finish.

If your hair feels dry, unruly, or lacks shine, this rich mask targets the hair fiber to provide hydration and manageability. Formulated with Keratin-Alpha Shaper and amino-acid chains, it works into the cortex to reshape and tame strands while delivering an immediate softening effect. It’s alcohol-free and free from artificial colorants, making it a professional-strength option suitable across hair types.

How does this mask improve frizz and manage volume?

The formula focuses on smoothing the hair’s keratin structure to reduce surface irregularities that trap humidity and create frizz. Regular use within the Keratin Alpha Sleek routine visibly lowers frizz and reduces bulk, resulting in a sleeker silhouette that’s easier to style.

• Targets the hair fiber with Keratin-Alpha Shaper to smooth cuticles
• Reduces frizz by up to 84% when used as directed within the routine
• Helps decrease visible volume by up to 76% for improved manageability
• Works on all hair types, from fine to coarse, to tame unruly strands

What immediate benefits will I see after one use?

From the first application the mask delivers noticeable softness, hydration, and shine. Its rich, sensorial texture coats strands for instant slip, making hair easier to detangle and style right away.

• Instant softness and improved comb-through ease
• Visible shine and smoother surface appearance after rinsing
• Hydration that reduces dryness and roughness on the strand
• Salon-like finish that enhances styling results

How should I use this mask for best results?

Incorporate the mask into your regular wash routine to strengthen and smooth the hair fiber. For extended smoothing, alternate the mask with the Keratin Alpha Sleek Smooth Transformer as recommended to extend frizz control between washes.

• Apply to freshly shampooed, towel-dried hair and distribute evenly
• Leave on for the time suggested on the product packaging, then rinse thoroughly
• For up to two weeks of enhanced smoothness, use the Smooth Transformer weekly and the mask on alternate wash days
• No alcohol and no artificial colorants, making it comfortable for repeated use

Is this mask safe for my hair type and routine?

This professional treatment is formulated to suit all hair types and is crafted without alcohol and artificial colors to reduce potential harshness. It can be included in color-treated or chemically styled hair care routines, though pairing with your stylist’s advice is recommended for specific treatments.

• Suitable for straight, wavy, curly, and coily textures
• Alcohol-free formula to limit drying effects
• Free of artificial colorants and designed for salon-level results at home
• Integrates with other Keratin Alpha Sleek products for extended smoothing

Who is this for: This mask is ideal for anyone seeking a professional-strength smoothing treatment—people with frizz-prone, dry, or voluminous hair who want immediate softness and improved manageability. It also fits clients who follow color or chemical services and want a gentler, salon-grade option to restore shine and tame the hair’s keratin structure.