KÉRASTASE Bain Extentioniste Strengthening Shampoo 8.5 fl oz — fortifies fragile lengths

KÉRASTASE Bain Extentioniste is a daily strengthening shampoo formulated to cleanse the scalp while fortifying fragile lengths and visibly reducing split ends.

This salon-grade shampoo blends amino acids with Creatine R, ceramides and taurine to help rebuild hair fibre strength from the roots to the ends. Its lightweight lather removes build-up without weighing hair down, leaving strands easier to detangle and preparing them for complementary conditioners or masks in the Resistance Extentioniste line. Ideal for hair stressed by heat, chemical services, or mechanical damage, the formula aims to support healthier-looking growth rather than promising accelerated biological growth.

How does this shampoo strengthen weakened hair?

The formula focuses on reinforcing the hair’s internal structure by delivering targeted ingredients that interact with the fibre. Amino acids help condition and smooth cuticles while Creatine R contributes to fibre resilience, supporting ends that are prone to splitting.

• Contains amino acids that condition and support cuticle integrity.
• Creatine R helps bolster fibre structure and resistance to breakage.
• Ceramides and taurine lock in moisture and add a protective layer to strands.

What results can I expect with regular use?

With consistent use, hair appears stronger and more uniform in texture; split ends look minimized and lengths feel smoother. Users often notice easier detangling and less visible roughness along the shaft, especially when paired with the matching conditioner or a strengthening mask.

• Smoother mid-lengths and ends with reduced frizziness.
• Improved manageability for styling and brushing.
• Complementary products amplify overall conditioning and protection.

How should I use Bain Extentioniste for best effect?

Wet hair thoroughly, then apply a small, coin-sized amount and massage gently from the scalp through the lengths until it lathers. Rinse fully and follow with Resistance Extentioniste Conditioner or a repair mask for targeted reinforcement of fragile ends.

• Use daily or as needed to remove impurities without stripping moisture.
• Concentrate on lengths and ends to address areas of damage.
• Pair with Resistance Extentioniste Conditioner and Therapiste Mask for deeper restoration.

Will this product work on chemically treated or heat-damaged hair?

Yes—its gentle cleansing and fortifying ingredients are designed to support hair compromised by color, heat tools, or chemical services. While it doesn’t reverse chemical changes, it helps reinforce fibres and make damaged hair easier to manage, reducing the appearance of split ends.

• Safe for color-treated hair when used as directed.
• Helps protect hair from further mechanical and thermal stress.
• Best results when included in a regimen with other strengthening products.

Who is this for: KÉRASTASE Bain Extentioniste suits anyone with slow-growing, brittle, or length-trained hair that needs targeted reinforcement—particularly those who style with heat or have experienced chemical services. It’s made for people seeking a lightweight daily cleanser that focuses on fibre repair and easier manageability without adding weight. If your priority is stronger-looking lengths, reduced split-end visibility, and a smoother finish when drying and styling, this shampoo fits into a restorative haircare routine when combined with the matching Resistance Extentioniste treatments.

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.