* [[Echinacea]] (Echinacea augustifolia): The tincture of echinacea root is a well-known anti-infective.
* [[Andrographis]] is sometimes called Indian echinacea because of its use for colds and flus.
* [[Astragalus]] (Herb) promotes white blood cell production to fight infection.
* [[Poke Root]](Phytolacca americana): The tincture of this root is so powerful some authors consider it poisonous. You may have a hard time finding it for sale. But poke is an important helper when flu "bugs" have taken over.
* Elecampane (Inula helenium): The tincture of this root is a favorite for clearing lung infections and countering the flu.