Confrey, symphytum officinale, is a mucilaginous herb with a slight astringent quality. It has been used for generations to aid in the healing of injuries. Not only does it contain important minerals needed in the healing process, but it also contains allantoin, a substance that stimulates cell growth. Comfrey is primarily used externally in compresses, poultices, and salves. It has been used internally, but most herbalists no longer use it this way because of concerns about hepatic toxicity
Completely safe for topical use. It contains pyrrolizidine alkaloids, which are believed to cause liver problems when taken internally. Many people have used comfrey internally with no reported ill effects, and it is probably safe to use internally for short periods. It should be avoided during pregnancy, lactation, when cancer or tumors are present, or when there is a history of liver problems.
This can be taken as an infusion, or topical use.