Goldenrod is used to tone the urinary tract and detoxify the kidneys. Clinical trials in animals suggest that goldenrod may reduce inflammation and fight infections, and is a diuretic.
The effective plants include Solidago species, not Verbascum densiflorum. If you are allergic to ragweed, chrysanthemums, marigolds and others, you should avoid taking goldenrod.
Goldenrod is often taken as a tea or tincture.