The use of Horehound in folklore extends back in history and was written about by the 1st century BC. It appears in numerous ancient herbal texts, including De Medicina by the Roman author Aulus Cornelius Celsus , who discussed its use to support respiratory health*, which many still use it for today. Other herbalists have mentioned Horehound thoughout history, such as John Gerard, The Herball, and Dr. John Tennent, Every Man His Own Doctor: or, The Poor Planter’s Physician .