AUTHOR=Panossian Alexander TITLE=Challenges in phytotherapy research JOURNAL=Frontiers in Pharmacology VOLUME=14 YEAR=2023 URL=https://www.frontiersin.org/journals/pharmacology/articles/10.3389/fphar.2023.1199516 DOI=10.3389/fphar.2023.1199516 ISSN=1663-9812