Natural Factors Echinamide Cold & Cough Syrup - Now one of the most popular herbal medicines in North America, Echinacea is a proven immune system enhancer, with antiviral and antibiotic activity. Natural Factors Echinamide is a patented-process, super-extracted Echinacea Purpurea, which preserves all active components responsible for Echinacea's efficiency and concentrates them in a potent liquid. Natural Factors Echinamide Cold and Cough Syrup is lemon-mint flavoured, standardized extract of Echinacea Purpurea, designed to naturally suppress coughs, and sooth and heal sore throats.