KERASTASE Résistance Bain Extentioniste Strengthening Shampoo 250ml

KERASTASE Résistance Bain Extentioniste 250ml is a professional strengthening and anti-breakage shampoo for weakened, brittle hair, designed to reinforce the hair fibre from root to tip and support stronger, healthier-looking lengths as hair grows longer.

KERASTASE positions Bain Extentioniste as a strengthening shampoo for hair-growth goals, formulated with Creatine R and Taurine to improve resilience and elasticity while cleansing the scalp and reinforcing weakened hair prone to breakage.

Strengthens weakened hair – Helps rebuild and reinforce the internal structure of brittle strands.

Anti-breakage care – Makes weakened hair more resistant to breakage as it grows.

Supports long-hair goals – Helps maintain stronger lengths so hair can reach its healthy-looking length.

Improves elasticity – Supports strength and resilience from roots to ends.

Purifies the scalp – Removes dirt, impurities and excess oil while supporting a healthy scalp environment.

250ml · Strengthening Shampoo · Anti-Breakage · Long Hair · Brittle Hair · Creatine R + Taurine

Best for: Weakened hair • Brittle hair • Breakage-prone hair • Long hair • Hair being grown longer • Damaged lengths • Customers struggling to maintain length

What Is It?

KERASTASE Résistance Bain Extentioniste 250ml is the cleansing and strengthening first step of the Extentioniste routine.

KERASTASE developed Extentioniste around a common problem with growing longer hair: the hair may continue growing at the root, but weakened lengths can break before the customer achieves their desired length.

Bain Extentioniste helps address this through:

Cleanse → Strengthen → Improve Elasticity → Reduce Vulnerability to Breakage → Support Stronger Lengths

KERASTASE says it rebuilds and seals weakened hair to provide greater protection throughout its growth, while also purifying the scalp.

Bain Extentioniste vs Bain Force Architecte

These two Résistance shampoos should have different positions on Peggymou.

Bain Extentioniste
→ Weakened/brittle hair
→ Breakage
→ Long-hair goals
→ Strength & elasticity
→ Length maintenance

Bain Force Architecte
→ Structurally damaged/weakened hair
→ Repair and reconstruction
→ Damage-focused Résistance care

KERASTASE itself describes Bain Extentioniste as strengthening and length-boosting, whereas Bain Force Architecte is positioned specifically around rebuilding weakened and damaged hair fibres.

So:

“I want to grow my hair longer but it keeps breaking” → Bain Extentioniste

“My hair is seriously damaged and needs repair” → Bain Force Architecte

Bain Extentioniste vs Genesis

Another important SEO distinction:

Résistance Extentioniste → Stronger lengths, breakage reduction and long-hair goals.

Genesis → Hair prone to falling due to breakage and anti-hair-fall care.

So I would not make “hair loss shampoo” a primary keyword for Bain Extentioniste. That search intent belongs much more naturally to Genesis.

Why You'll Love It

• Professional strengthening shampoo
• Designed for weakened and brittle hair
• Helps reinforce the hair fibre
• Supports elasticity from root to tip
• Makes hair more resistant to breakage
• Helps maintain stronger lengths
• Supports long-hair goals
• Purifies the scalp
• Removes impurities and excess oil
• Helps improve shine
• Prepares hair for conditioning
• Contains Creatine
• Contains Taurine
• Part of the complete Extentioniste strengthening routine
• 250ml

KERASTASE specifically highlights increased elasticity and strength from root to tip, restored fibre strength, scalp purification and improved shine through the lengths and ends.

Who Is It For?

Ideal for:

Weakened hair
Brittle hair
Breakage-prone hair
Long hair
Hair being grown longer
Hair struggling to maintain length
Hair lacking strength
Hair lacking elasticity
Damaged lengths
Split-end-prone hair
Customers wanting stronger, longer-looking hair
Customers following the Extentioniste routine

Pair Me With

KERASTASE Résistance Fondant Extentioniste Conditioner – The lightweight strengthening and detangling treatment for weakened lengths.

KERASTASE Résistance Masque Extentioniste Strengthening Hair Mask – Choose when brittle or damaged lengths require more intensive strengthening and conditioning.

KERASTASE Résistance Sérum Extentioniste Scalp Serum – The scalp-focused leave-in step within the Extentioniste long-hair routine.

KERASTASE Résistance Thermique Extentioniste Heat Protectant – Protects the lengths during heat styling while helping reduce breakage and seal damaged ends.

KERASTASE structures Extentioniste as a root-to-tip routine, targeting the scalp first, then reinforcing the lengths and finally protecting/sealing the ends.

Recommended Routine

For regular weakened/breakage-prone hair:

Bain Extentioniste → Fondant Extentioniste → Sérum Extentioniste → Thermique Extentioniste

For brittle or more damaged lengths:

Bain Extentioniste → Masque Extentioniste → Sérum Extentioniste → Thermique Extentioniste

Resistance Bain Extentioniste Strengthening Shampoo | Kérastase UK

Step 1
Apply the shampoo to wet hair.

Step 2
Lather by adding a little water.

Step 3
Emulsify and rinse. .

Step 4
For best results use with Fondant Extensioniste.

Aqua, Water, Sodium Laureth Sulfate, Coco-Betaine, Taurine, Cocamide Mipa, Sodium Chloride, Amodimethicone, Laureth-5 Carboxylic Acid, Ppg-5-Ceteth-20, Sodium Benzoate, Polyquaternium10, 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, Sodium Hydroxide, Citric Acid, Parfum, Fragrance