Comfrey is very popular for healing skin and encouraging bone healing. The active ingredients in comfrey herb are allantoin (a substance that fosters the growth of new cells), rosemarinic acid (an anti-inflammatory), and mucilage (a gummy substance that soothes inflamed tissues).
Botanical name: Symphytum officinale
Safety: For external use only. Do not apply to broken or abraded skin. Not to be used during pregnancy or while nursing. Not recommended for long term use. Do not use comfrey on dirty wounds as rapid healing can trap the dirt or pus.