Again me Hair Thickening Shampoo – Biotin & Hyaluronic Acid | Korean Growth Formula 13.5 ozHealthy hair starts with a healthy scalp Healthy looking hair begins with care that reaches the scalp. Again me Hair Thickening Shampoo blends biotin, hyaluronic acid, and plant based surfactants to cleanse, hydrate, and support the look of fuller hair from root to tip. The formula is designed for daily use on a variety of scalp types, including dry, damaged, and oily scalps, and its safe for color treated hair. In a four week clinical study,