L'Oreal Professionnel Serie Expert Inforcer Conditioner for normal to fragile hair. Infused with Biotin and Vitamin B6, hair is strengthened to treat current breakage and prevent future breakage while adding lightweight nourishment and hydration. Vitamin B6 promotes hair growth and stimulates protein metabolism to strengthen the hair fiber. Biotin stimulates fatty acid metabolism to promote healthy hair development. With each use, the hair is softer, smoother and detangled.