Echinacea purpurea powder comes from the purple coneflower. People reach for it early in a cold to support the immune system.
The powder mixes easily into water, juice, or tea. A common pattern is several doses a day for only a few days, right when symptoms surface.
Watch out for interactions with immunosuppressant drugs. Do not take this herb if you have an autoimmune condition or an allergy to ragweed or similar plants.