Comfrey

Name: Symphytum officinaleDistribution: Europe and North AmericaMedicinal Use: promotes wound healing and as skin treatment, external use only due to pyrrolizidine alkaloids which may cause liver damage.Activity: Also called boneknit (because of its use to promote bone healing) or healing blade is a long known medicinal plant. Comfrey contains a small organic molecule, allantoin which is thought to promote wound healing and cell proliferation.