A fortifying shampoo for hair you want to grow longer
Kérastase Résistance Bain Extentioniste is a shampoo from Kérastase's Extentioniste line, made for long hair or hair on its way to length. It cleanses while strengthening the fibre so strands break less, helping hair keep the length it grows.
The texture
A smooth, creamy shampoo that spreads through long lengths easily and rinses out clean. It is the first step of the Extentioniste routine, followed by the mask or serum.
Who it suits
- Long hair that snaps before it reaches the length you want
- Hair that is growing out and needs to stay strong
- Anyone who wants fewer split ends on lengths
- Users of the Extentioniste mask or serum
Worth knowing before you buy: This shampoo helps hair keep its length by reducing breakage. It does not make hair grow faster.
Complete the routine

Resistance Masque Extentioniste
A mask from the same line.
Shop →
Resistance Serum Extentioniste
A leave-in serum for long hair.
Shop →Characteristics
- Format: Shampoo, 250ml
- Hair type: Long or growing-out hair
- Concerns: Breakage, weak lengths, split ends
- When to use: Every wash
- Main benefits: Strength, less breakage, retained length
How to use
Massage into wet hair from roots to ends, rinse thoroughly, then follow with the Extentioniste mask or conditioner.
Manufacturer information
Brand: Kérastase (L'Oréal Professionnel Produits)
Address: 14 rue Royale, 75008 Paris, France
EAN: 3474636612666
