KÉRASTASE Bain Extentioniste Strengthening Shampoo for Damaged Hair — 16.9 oz, Fortifies & Smooths

KÉRASTASE Bain Extentioniste is a strengthening shampoo designed to rebuild weakened, damaged lengths while preparing hair for deeper conditioning.

This salon-grade cleanser targets fragile hair with a formula that works from root to tip. It gently removes buildup and impurities without stripping moisture, while active ingredients focus on fortifying the hair fiber and improving surface condition. The result is smoother, stronger strands that are easier to detangle and style—ideal when you want to protect and lengthen growing hair.

How does this shampoo strengthen damaged lengths?

The formula combines amino-acid derivatives and surface-repairing lipids to reinforce the hair’s internal and external structure. These actives penetrate and shore up weak points in the fiber, helping reduce breakage and split ends over time.

• Contains Creatine R to penetrate and reinforce the hair cortex.
• Ceramides help rebuild and smooth the cuticle for a healthier surface.
• Taurine supports a balanced scalp environment to maintain hair resilience.

Will it work on chemically-treated or color-treated hair?

Bain Extentioniste is formulated to be gentle while still effective, making it compatible with most color and chemical services. It cleanses without harsh sulfates and helps protect compromised lengths that often result from coloring or heat styling.

• Safe for use on colored and chemically treated hair when used as part of a haircare routine.
• Prepares hair for masks and serums, improving product absorption.
• Leaves hair smoother, which can preserve color vibrancy by reducing surface roughness.

How should I use this shampoo for best results?

Apply to wet hair, emulsify, and focus on roots and lengths where damage is concentrated. Rinse thoroughly and follow with a targeted conditioner or mask from the Resistance/Extentioniste range for optimal strengthening and manageability.

• Use 2–3 times weekly, or as needed based on hair condition and styling frequency.
• Pair with a concentrated mask or leave-in treatments to maximize fiber repair.
• Gentle lathering and a final cool rinse improve cuticle closure and shine.

What visible benefits can I expect and when?

With consistent use, hair generally becomes easier to detangle, displays improved surface smoothness, and shows fewer breakage points. While individual timelines vary, many notice enhanced manageability within a few washes and progressive strengthening over weeks.

• Immediate: cleaner, shinier-looking strands and softer feel.
• Short term: reduced tangles and improved comb-through after a few uses.
• Long term: stronger lengths and fewer split ends with regular routine use.

Who this is for: Bain Extentioniste is suited for people aiming to grow longer hair or repair weakened lengths—especially those who regularly use heat tools, undergo chemical treatments, or struggle with breakage. If your priority is to strengthen the hair fiber while maintaining a gentle cleansing experience, this KÉRASTASE shampoo pairs well with targeted conditioners and scalp-supporting products in a complete haircare regimen.

Ingredients

Aqua / Water \\u25cf Sodium Laureth Sulfate \\u25cf Coco-Betaine \\u25cf Taurine \\u25cf Cocamide Mipa \\u25cf Sodium Chloride \\u25cf Amodimethicone \\u25cf Laureth-5 Carboxylic Acid \\u25cf Ppg-5-Ceteth-20 \\u25cf Sodium Benzoate \\u25cf Sodium Hydroxide \\u25cf Citric Acid \\u25cf Polyquaternium-10 \\u25cf Peg-55 Propylene Glycol Oleate \\u25cf Propylene Glycol \\u25cf Peg-60 Hydrogenated Castor Oil \\u25cf Salicylic Acid \\u25cf Amyl Cinnamal \\u25cf Hexyl Cinnamal \\u25cf Benzyl Alcohol \\u25cf Linalool \\u25cf Hydroxycitronellal \\u25cf Citronellol \\u25cf Limonene \\u25cf Creatine \\u25cf 2-Oleamido-1,3-Octadecanediol \\u25cf Benzyl Cinnamate \\u25cf Sodium Acetate \\u25cf Isopropyl Alcohol \\u25cf Parfum / Fragrance.