Comfrey has been traditionally used to help heal broken bones, sprains, and bruises, it is also known as "knitbone" due to its ability to promote the healing of bones and tendons. The herb contains allantoin which is believed to be the main compound responsible for its ability to speed up the healing process.
Comfrey has also been traditionally used to relieve pain, reduce inflammation and to help reduce symptoms of respiratory issues such as asthma and bronchitis. It is also believed to help improve digestive issues such as stomach ulcers and colitis. Comfrey should be used with caution, as it may cause liver damage when consumed in large doses or for prolonged periods of time. It should not be used by pregnant or breastfeeding women.