Comfrey
Botanical Name: Symphytum Officinale
 
Traditionally used externally to promote healing of wounds and fractures, comfrey is rich in calcium and vitamin C, aiding in the stimulation of healing processes. In folk medicine, it is often called 'Knit Bone' for its reputed ability to accelerate recovery.  
 
Warning: For external use only. Do not use during pregnancy or while nursing. Avoid applying to broken or abraded skin.