Biosilk Silk Therapy Original is a nourishing leave-in treatment that can be used on all hair types, it helps to protect hair while leaving it silky smooth. This light-weight formula seals cuticles of the hair to prevent them from splitting and leaving hair with a healthy shine. To use: Shake the bottle well before use, place a small amount in the palm of your hands and apply from the scalp to the ends of the hair. It may be used on wet/dry hair or skin, use as often as necessary.