What it Does. Bio. Silk Silk Therapy Original is a weightless leave-in silk replenishing and reconstructing treatment that helps repair, smooth and protect all hair types.Fills voids in cuticle to create smooth hair. Aids in preventing split ends. Provides incredible shine. How to Use Shake well before use. Place a small amount of silk therapy in the palms and apply from the scalp to ends. May be used on wet or dry hair or skin. Us as often as necessary.Concerns: Shine, Dryness. Formulation: Serum. Country of Origin: Made in US