Thompson's Ultra Echinacea Complex 3500+ is a high potency formula that maintains upper respiratory tract health and supports the body's own natural immune system to bring prompt, effective relief from the symptoms of colds, flu and minor infection. Thompson's Ultra Echinacea Complex 3500+ is a high potency formula that maintains upper respiratory tract health and supports the body's own natural immune system to bring prompt, effective relief from the symptoms of colds, flu and minor infection. Echinacea is recommended for upper respiratory tract infections such as cold and flu and may help soothe a sore and inflamed throat. As both Echinacea angustifolia and Echinacea purpurea exhibit a different profile of beneficial compounds, it makes sense to incorporate both types of Echinacea together in a complex. Furthermore, because different parts of the Echinacea plant yield stronger concentrations of actives, it is useful to combine roots and aerial parts of the plant to give a full spectrum of active ingredients. At the acute dose the formula provides an equivalent of more than 3500mg of dry Echinacea herb.