BioSilk Silk Therapy Original is a versatile serum that works to repair, smooth, and protect all hair types. Infused with natural silk proteins, it penetrates the hair shaft to strengthen and moisturize from within. This lightweight formula helps to eliminate frizz and flyaways, adds incredible shine, and protects hair from environmental damage. Ideal for use on wet or dry hair as a leave-in treatment, it leaves hair looking and feeling healthy and vibrant.