Black Horehound
Parts Used & Where Grown
This European mint family (Lamiaceae) plant now grows in North America and on other continents as well. The leaf and flower are used medicinally. This plant should not be confused with white horehound, which acts differently.
How It Works
Phenylpropanoids—flavonoids and compounds found in the volatile oil of black horehound—are believed to be the plant’s major active constituents.1,2 A recent test tube study found black horehound phenylpropanoids to have both antioxidant properties and a sedating effect on overactive nerve cells.2 Although no human studies have been conducted with black horehound, the herb is believed to be useful for treating nausea associated motion sickness due to a possible effect on the central nervous system.4
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