Allantoin

Allantoin originally came from the comfrey plant. The common name for the comfrey plant was "bone knit" for it's ability to speed up recovery time of broken or fractured bones. However, because comfrey is toxic in large quantities other sources were found in umbilical cords and animal urine. Today it is synthesized so dont get grossed out. Allantoin has similar properties to salicylic acid and will remove warts and scars. It works by softening keratin and increasing the water content in the skin.