There is a growing amount of evidence-based research supporting various botanicals; and/or primary evidence comes from a long medicinal use. Evidence-based research may be limited, but we shouldn't ignore botanicals that have been used for 1000s of years,
ProofPower is a suite of tools supporting specification and proof in Higher Order Logic (HOL) and in the Z notation...All the ProofPower packages except PPDaz are free, open-source, software made available under the terms of the GNU General Public License. (PPDaz is Ada stuff)