AUTHOR=Vllasaliu Driton TITLE=Grand challenges in oral drug delivery JOURNAL=Frontiers in Drug Delivery VOLUME=5 YEAR=2025 URL=https://www.frontiersin.org/journals/drug-delivery/articles/10.3389/fddev.2025.1571982 DOI=10.3389/fddev.2025.1571982 ISSN=2674-0850