HRI Cold & Flu Echinacea is a traditional herbal medicinal product used to relieve the symptoms of colds and influenza (flu) type infections. Based on traditional use only. Take at first signs of a cold and help protect against winter colds and flu. HRI Cold & Flu Echinacea is a traditional herbal medicinal product used to relieve the symptoms of colds and influenza (flu) type infections. Based on traditional use only. Take at first signs of a cold and help protect against winter colds and flu.