BioSilk is the original silk infused line of hair care products using natural pure silk in every product. Silk contains 17 of the 19 amino acids in hair and is the strongest fiber in the world..equal to steel. Silk reconstructs damaged cuticles, strengthens hair, adds moisture, and revitalizes and rejuvenates hair for soft, supple, shiny results. Silk also protects against heat, cold, humidity, UV rays and pollution. BioSilk Silk Therapy is an original weightless, leave-in silk replenishing and reconstructing treatment that fills any voids in cuticle layers for smooth results. It helps temporarily repair split ends and is ideal for all hair types.