A lightweight, non-greasy scalp and hair serum infused with Rosemary Oil, Tea Tree Oil and Biotin that repairs hair damage up to 85%*. This fast-absorbing formula promotes the appearance of thicker hair while strengthening strands. Inspired by big-budget scalp and hair serums, HASK’s Strength & Length Boosting Scalp & Hair Serum provides premium performance at an accessible price.