FULLER Active Hair Serum is a lightweight, plant-based, powerful combination of high performing, clean botanical ingredients designed to transform hair’s health and appearance without sulfates, parabens, silicones, phthalates or other harsh chemicals. Created to fortify hair, Redensyl is a Swiss ingredient that strengthens, improves and thickens hair follicles, and Follicusan stimulates hair growth while reducing hair loss. The result is a head full of thicker, fuller, healthier hair.