Comfrey is a perennial herb related to forget-me-not and borage. Also known as Bruisewort and Knitbone, comfrey has earned an entry in every Materia Medica written since the 15th century, although it's been in use for much longer.
Due to the presence of pyrrolizidine alkaloids, comfrey leaf is limited to topical uses today but should not be applied to open wounds.
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