{"generated_at":"2026-05-15T03:58:47.529Z","site_url":"https://h2-papers.org","seed_query":"(\"hydrogen molecule\" OR \"molecular hydrogen\" OR \"H2 inhalation\" OR \"hydrogen-rich water\" OR \"hydrogen rich water\") AND (medic* OR clinic* OR therap* OR treatment) NOT (review AND retracted)","papers_total":1168,"papers_extracted":1168,"papers_pending_extraction":0,"papers_by_year":{"1974":1,"1976":1,"1978":1,"1981":1,"1988":1,"1989":1,"1994":2,"1995":2,"1997":1,"1999":1,"2000":2,"2001":5,"2002":4,"2003":2,"2004":3,"2005":5,"2006":6,"2007":7,"2008":10,"2009":12,"2010":15,"2011":33,"2012":33,"2013":34,"2014":44,"2015":49,"2016":54,"2017":64,"2018":57,"2019":61,"2020":79,"2021":115,"2022":84,"2023":97,"2024":89,"2025":129,"2026":63},"papers_by_study_type":{"animal":426,"human_case":35,"human_observational":32,"human_rct":79,"in_vitro":160,"letter":7,"meta_analysis":12,"other":238,"review":179},"papers_by_delivery_method":{"animal":16,"bath":8,"hydrogen_water":321,"in_vitro":183,"inhalation":159,"injection":73,"mixed":152,"na":236,"topical":20},"papers_by_effect":{"adverse":2,"mixed":73,"not_assessed":423,"null":11,"positive":659},"papers_predatory_flagged":0,"lineage_pmids":["26504515"],"note":"Coverage = papers ingested from the seed PubMed query as of generated_at. Not a clinical recommendation system. See /safety-notes/ for safety guidance, never inferred from per-paper effect counts."}