Transparency
Our Sources
We cross-reference every entry with peer-reviewed research and trusted databases. These are the 13 sources we rely on — and why we trust them.
Primary literature & citations
PubMed
The NIH/NLM database of 35M+ citations from peer-reviewed biomedical literature. Our primary source of clinical evidence.
VisitEurope PMC
The European database of biomedical literature and abstracts — open access to millions of articles.
VisitOpenAlex
An open catalog of scholarly works, authors and institutions — a free alternative to commercial databases.
VisitSemantic Scholar
AI-powered paper search and citations from the Allen Institute for AI.
VisitCrossRef
The DOI registry and scholarly metadata. It verifies the identity and citability of every source.
VisitDOAJ
The Directory of Open Access Journals — a quality check for open publishing.
VisitClinical & regulatory
Specialized data
USDA FoodData Central
The USDA's official nutrition database — food composition and nutrient data.
VisitPubChem
The NIH database of chemical compounds — structure and properties of active substances.
VisitSUPP.AI
Supplement–drug interactions mined from the scientific literature (Allen Institute for AI).
VisitJ-STAGE
Japan's scientific article platform — key for the Kampo tradition.
VisitUnpaywall
Finds the legal open-access full text of a study by its DOI.
VisitWe also grade every claim by strength of evidence (level 1–4) — from strong randomized trials to traditional use — so you know how solid the ground beneath it is.