The German Commission E monograph suggests 1/2–3/4 teaspoon (2–4 grams) of the powder per day.¹⁶ A tea can be prepared from the powdered herb by boiling 1/2 teaspoon (2–3 grams) of the powder for ten to fifteen minutes, cooling, and then drinking. No more than a few drops of volatile oil should be used and only for a few days at a time. A tincture (1/2 teaspoon or 2–3 ml) may also be taken three times per day.