Reporting Gaps in Human Medicinal Mushroom Studies: Implications for Interpretation, Formulation, and Real-World Use

Human studies on medicinal mushrooms are increasingly cited in scientific, clinical, and commercial discussions, yet interpretation is often weakened by incomplete reporting of the tested intervention material. This work examined published human studies on Lion’s Mane (Hericium erinaceus) and Reishi (Ganoderma lucidum / Lingzhi), with a primary focus on fruiting-body-derived interventions, while retaining selected mixed or incompletely characterized preparations as contextual examples of reporting limitations, in order to assess both dosage history and reporting quality. The aim was not to propose final dosage recommendations, but to identify what human studies actually report and where interpretation becomes unreliable. Across the reviewed literature, Lion’s Mane studies showed a more clustered dosage history for fruiting-body-based interventions, whereas Reishi studies spanned a broader and more heterogeneous range of nominal doses and preparation types. A consistent finding was that dosage is often reported more clearly than intervention identity. In many studies, crucial details such as fungal part used, species identity and identity verification, cultivation substrate and conditions, harvest maturity and post-harvest handling, extraction and processing method, carrier and excipient content, batch identity and consistency, and compounds of interest or metabolite profile were absent or incompletely described. As a result, nominal daily dose alone is often an insufficient basis for comparing studies or translating findings to formulation practice or real-world product use. This review suggests that medicinal mushroom research would benefit from stronger reporting discipline and clearer minimum standards for intervention description, material characterization, and metabolite profiling. Better linkage between human intervention studies and well-characterized mushroom materials may improve future dosage interpretation for both whole preparations and compounds of interest.