This patented bioactive peptide treatment strengthens and improves elasticity while reversing damage from chemical services, thermal styling, and mechanical styling. For all hair types. Hair like new. This leave-in mask heals and strengthens hair with lightweight moisturizing benefits to detangle and keep hair smooth and soft, without weighing it down. The 5mL starter size is a 2-application dose for most hair types. Please see dosage chart for exact usage. For best results, use on consecutive washes.