Bain Extentioniste is a hair strengthening shampoo and a hair strengthening treatment that boosts strong hair growth starting at the roots. Bain Extentioniste is a shampoo to help hair grow not only in length but in strength with Creatine, an amino acid that reinforces the internal structure of the hair fiber. Weak hair and breakage-prone strands are strengthened with this hair strengthening treatment. The internal structure of hair is rebuilt and sealed to provide greater protection throughout its growth. Growing hair out has never been easier with our shampoo for long hair growth, Bain Extentioniste.