Boost volume. Strengthen strands. Achieve visibly thicker hair. Viviscal PRO Thickening Serum is a lightweight, leave-in formula designed to promote thicker, fuller, and healthier-looking hair. Featuring biotin, collagen and keratin, this lightweight, leave-in treatment helps encourage healthy hair growth while minimizing blow-dry time. It's formulated with proven ingredients that help stimulate and strengthen follicle stem cells to prevent hair loss. Suitable for all hair types. Helps improve a dry scalp. Promotes overall scalp health. Key Benefits: Promotes thicker, fuller, and healthier-looking hair Strengthens and nourishes hair from root to tip Helps reduce breakage and shedding Supports scalp health for optimal growth conditions Adds lightweight volume and shine Suitable for all hair types, including thinning and color-treated hair