BioSilk is exceptional due to being the first to use natural silk in hair care. Silk is the strongest fiber, yet remains extremely light in hair and restores, smoothes and protects all hair types. Silk protein gives shine, smoothness and prevents splitting of the ends. BioSilk Therapy continues to be one of the company's strongest product lines, having won countless beauty awards over the years and is a recognized brand among 97% of women. All BioSilk products contain pure natural silk and are free of gluten, sulfates and parabens.