Echinacea has been used for virus infections such as the common cold and flu. It is used to strengthen the immune system.

It has also been used for returning vaginal fungal infections ("yeast infections") along with antifungal products applied to the vaginal area.

The roots have high concentrations of volatile oils, while the parts that grow above the soil tend to contain more polysaccharides.

Decoct or tincture for used in topical preparations.

The root can be used to make a cooling, spicy, acrid-tasting tea. Decoct as tea, alone or with other herbs and roots. 
To use as a tea, add 1/2 tsp. of the root to a tea infuser and place in a tea cup. Pour boiling water over infuser, cover, and steep for 3-5 minutes.

Use withg caution if there is a known allergy to plants in the ragweed family.