In the root of every plant there are compounds that have an effect on humans and their biology. Science is looking into it with the help of tools to see how the DNA is built and composed.  Phytochemicals are chemical compounds produced by plants, generally to help them resist fungi, bacteria and plant virus infections, and also consumption by insects and other animals. The name comes from Greek φυτόν (phyton) ‘plant’. Some phytochemicals have been used as poisons and others as traditional medicine