Beyond Bioactivity: An Exposure-Aware Organoid Framework for Natural-Product Discovery and Translation

Natural products offer diverse chemical structures and pharmacological activities for therapeutic discovery. Their translation benefits from evidence that connects a reproducible preparation with relevant exposure and a clearly defined biological response. Organoids can strengthen this evidence by providing tissue architecture, cellular diversity, and donor-specific features suited to focused experimental questions. This critical narrative review uses a structured literature search to synthesize representative natural-product studies across tumor, intestinal, hepatic, renal, pulmonary, cortical, retinal, and cardiac platforms. Direct organoid evidence, findings from related three-dimensional models, and prospective applications are distinguished by material, species, derivation, exposure, and endpoint. The selected examples illustrate these distinctions rather than provide a comprehensive evidence map. We propose an exposure-aware conceptual decision framework linking material identity, assay compatibility, exposure plausibility, model fitness, functional activity, and context-specific validation. Six gates guide advance, iterate, or stop/redirect decisions and make the evidence supporting each claim explicit. The framework provides a practical structure for study design and reporting, with prospective evaluation as the next step. Roselle serves as an illustrative botanical example for future organoid testing. Used alongside analytical studies, two-dimensional cultures, animal models, and clinical research, qualified organoids can help move natural-product discovery toward reproducible, tissue-level, and decision-relevant evidence.