Echinacea Purpurea (Jamieson) is probably best known for the beneficial effects it can have on your immune system. Many individuals take Echinacea Purpurea when they feel a cold or flu coming on as a way to boost their immune system to fight off the symptoms or to help prevent them from having a cold or flu passed on to them. Taking Echinacea Purpurea is not a cure for the common cold or flu, but it can help your body resist becoming sick. Studies have also linked a reduction of inflammation and lower blood sugar levels to this group of flowering plants.