KÉRASTASE Bain Extentioniste Strengthening Shampoo 8.5 fl oz — Daily Fortifying, Reduces Split Ends

KÉRASTASE Bain Extentioniste is a daily strengthening shampoo formulated to cleanse the scalp, fortify fragile lengths, and help reduce the appearance of split ends while supporting healthier growth.

This lightweight shampoo from KÉRASTASE’s Resistance Extentioniste line targets overstressed and damaged hair. Infused with Creatine R, ceramides, and taurine, the formula works to rebuild hair fibers, improve moisture retention, and protect strands from daily aggressors like heat and styling. It’s designed to be gentle enough for everyday use and pairs best with KÉRASTASE Resistance conditioners and masks to maximize reinforcement and length preservation.

How does this shampoo help strengthen fragile, length-focused hair?

Its active blend focuses on rebuilding the internal structure of the hair shaft while sealing and smoothing the cuticle. Creatine R helps reinforce the fiber, and ceramides support moisture balance and resilience for visibly stronger lengths.

• Reinforces hair fiber structure with Creatine R
• Restores cuticle integrity to reduce breakage
• Improves moisture retention with ceramides and taurine

Will it work on chemically treated or heat-stressed hair?

The formula is crafted for overstressed, brittle, and damaged hair, including strands affected by color, heat tools, or chemical services. It gently cleanses while delivering ingredients meant to reconstruct and protect weakened sections.

• Gentle daily cleansing suitable for treated hair
• Targets damage from heat styling and chemical processes
• Designed to be used alongside conditioners and masks for deeper repair

How should I use Bain Extentioniste for best results?

Apply a small, quarter-size amount to wet hair and massage from roots through ends until evenly lathered, focusing on lengths and tips. Rinse fully and follow with a complementary Resistance Extentioniste conditioner or Therapiste mask as needed for added fortification.

• Use daily or as tolerated by your hair type
• Massage thoroughly to stimulate the scalp and distribute actives
• Pair with Resistance Extentioniste Conditioner and Therapiste Mask for optimal reinforcement

What specific ingredients should I expect and why do they matter?

The key actives include Creatine R to strengthen internal fiber bonds, ceramides to lock in moisture and protect the cuticle, and taurine to support scalp health and resilience. Together they focus on structural repair rather than temporary smoothing alone.

• Creatine R — helps reconstruct weakened hair from within
• Ceramides — promote moisture retention and cuticle protection
• Taurine — supports scalp condition and fiber vitality

Who is this for? KÉRASTASE Bain Extentioniste suits people with slow-growing, brittle, or damaged hair who want a daily shampoo that focuses on fortifying lengths and minimizing split-end appearance. Ideal for hair exposed to heat styling, coloring, or mechanical stress, it works best when integrated into the Resistance Extentioniste routine for comprehensive strengthening and length maintenance.

Ingredients

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