Traditionally known in some cultures as "knitbone" or "boneset", the health benefits of this unassuming leafy green can be traced back to the ancient Greeks. Comfrey is widely appreciated for its capacity to help heal broken bones and damaged tissues. In more modern times, science has shown us that these healing properties are partly due to a compound called ‘allantoin’ which can accelerate cellular mitosis - the process of new tissue growth. Historically, comfrey also has a strong reputation for helping with external wounds that are healing poorly.