* [[St. John's wort]] (Hypericum perforatum)to prevent viral infections such as the flu. A dropperful in the morning throughout the cold months is adequate for prevention.
* [[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.
* [[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.