This is known as ‘knitbone’ in traditional circles, giving away its main use in the healing of injuries to bones. Do not underestimate its ability as a general vulnerary, though, to aid healing of bruises and injuries of all types. It has recently been maligned as a potential liver carcinogen, owing to the presence of small quantities of a substance somewhat related to the poison found in ragwort. This is, in some authors’ opinions, an overrated risk. Comfrey has been used effectively and safely for centuries, right up to the present time and there are no known side-effects consequent upon its correct usage. Beware of supplements intended for long-term use which contain it, however. Comfrey is used both internally, with the above caution, and as a poultice for wounds or leg injuries.