Research Literature
Where to find peer-reviewed studies and preprints.
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PubMed
The U.S. National Library of Medicine's index of biomedical literature.
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Europe PMC
Open-access life-science literature, including full text and preprints.
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Cochrane Library
Systematic reviews of healthcare interventions.
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medRxiv
Preprints in health sciences. Not yet peer reviewed — read with care.
Clinical Trials
Registries for finding ongoing and completed trials.
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ClinicalTrials.gov
Registry of clinical studies run around the world.
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WHO International Clinical Trials Registry Platform
Searches trial registries from many countries at once.
Organizations & Programs
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NIH Human Microbiome Project
Data and resources from the NIH Common Fund's Human Microbiome Project.
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International Scientific Association for Probiotics and Prebiotics (ISAPP)
Consensus statements and plain-language resources on probiotics, prebiotics, and related topics.