KÉRASTASE Resistance Bain Extentioniste Strengthening Shampoo — 16.9 fl oz | Rebuilds Fiber & Increases Elasticity

KÉRASTASE Resistance Bain Extentioniste is a length-strengthening shampoo that rebuilds weakened hair fibers to increase elasticity and prepare lengths for deep conditioning.

Designed for hair that struggles with breakage and lacks resilience, this salon-grade cleansing treatment targets the fiber from root to tip. Formulated with Creatine R, Ceramides and Taurine, it cleanses impurities while reinforcing the hair’s internal structure and smoothing the surface for healthier-looking lengths and improved manageability.

How does Bain Extentioniste actually make hair stronger?

The formula works on two levels: it penetrates the hair fiber to rebuild internal strength and it repairs the surface to reduce friction and breakage. Creatine R helps reinforce the cortex while ceramides smooth the cuticle; together they reduce weak points along the strand so hair bends and stretches without snapping.

• Creatine R rebuilds internal fiber resistance.
• Ceramides restore and smooth the hair surface.
• Taurine supports a stimulated, balanced scalp environment.
• Gentle surfactants cleanse without stripping essential moisture.

When should I use this shampoo in my routine?

Use Bain Extentioniste as the cleansing step whenever lengths need strengthening or before intensive conditioning treatments. It prepares hair to receive and retain the active ingredients from masks and serums, making subsequent treatments more effective.

• Start with wet hair; apply a small amount and lather at the roots.
• Work through lengths to the tips to distribute strengthening agents.
• Rinse and follow with a KÉRASTASE mask or leave-in for best results.

Will it work on all hair types and textures?

Bain Extentioniste is formulated to be effective across hair types—fine, medium or coarse—and is particularly beneficial for lengths that are weakened, chemically treated, or prone to mechanical damage. It cleanses and reinforces without weighing hair down when used as directed.

• Suitable for color-treated and chemically processed hair.
• Light enough for finer hair while providing structure for thicker textures.
• Safe to use regularly as part of a strength-focused routine.

What key ingredients should I know about and why do they matter?

The active trio—Creatine R, Ceramides and Taurine—targets different aspects of hair health: internal reinforcement, surface recovery, and scalp support. These ingredients work in combination to reduce breakage, smooth the fiber, and create a healthier base for growth and length retention.

• Creatine R: an amino-acid derivative that penetrates the fiber for structural support.
• Ceramides: rebuild and smooth the cuticle to reduce friction and split ends.
• Taurine: helps maintain a stimulated, balanced scalp environment for optimal hair condition.

Who is this for? Bain Extentioniste is ideal for anyone focused on growing and maintaining longer hair without compromising strength—people with weakened, stretched or chemically processed lengths who want a supporting shampoo that prepares hair for deeper nourishing treatments. Use it as your daily or regular cleanser within a rebuilding regimen to reduce breakage and improve manageability from root to tip.

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.