BioSilk is the original silk infused line of hair care products using natural pure silk in every product. Silk Therapy is the original weightless, leave-in silk replenishing and reconstructing treatment to repair, smooth and protect all hair types. Silk contains 17 of the 19 amino acids in hair and is the strongest fiber in the world equal to steel. BioSilk Silk Therapy is a lightweight leave-in treatment that helps moisturize and restructure your hair without heaviness. The silk proteins strengthen your hair from the inside out, vitamin B holds in moisture, and vitamin E with botanical extracts nourishes for shine and softness. In addition to repairing, BioSilk Silk Therapy also protects your hair from future sun damage and from the heat of your styling tools. The result is silky smooth, shiny hair.