Horehound is a garden mint with green and white leaves and a distinctively bitter taste. It is native to Asia and Europe, but is naturalized in North America. Although the herb grows in a wide range of climates, the best quality is grown in desert heat. Egyptian priests referred to it as the "Seed of Horus", which some speculate its modern name came from. In medieval Europe it was used to ward off spells by witches. It is also recorded as one of the "bitter herbs" eaten at Passover.
Marrubiin (the bitter substance in the herb), flavonoids including apigenin, luteolin, and vitexin, caffeic acid and stachydrine, and a small amount of essential oil and tannins.
The above-ground parts of the plant, dried and cut.
Usually as a tea, but also in infusions, tinctures, and encapsulations. Historically made as a candy or confection.