Search the right databases, in order
One database is not a literature review — MEDLINE alone misses roughly one in ten relevant papers. The credible minimum for clinical questions is three:
| Database | Role |
|---|---|
| PubMed / MEDLINE | Core biomedical literature (free) — start here |
| Embase | Drugs, devices, European journals + conference abstracts |
| Cochrane CENTRAL | Trials + existing systematic reviews |
| Scopus / Web of Science | Breadth + citation tracking |
| Google Scholar | Supplement only — weak filters, not reproducible |
Best AI tools for literature review (compared)
| AI tool | Its one job | Free tier |
|---|---|---|
| Research Rabbit | Citation-graph discovery | Yes |
| Semantic Scholar | Discovery + TL;DRs | Yes |
| AnswerThis | First-draft review + gap finder (250M papers) | 5 credits/mo |
| Consensus | Evidence agreement (Consensus Meter) | Yes (limited) |
| Elicit | Screen + extract findings into tables | Yes (limited) |
| Scite | Smart Citations: supported vs contradicted | Paid trial |
The honest rule
AI accelerates discovery and synthesis; it does not judge novelty, quality or ethics — you do. Never cite an AI-surfaced reference without opening the real paper, and use Scite to check whether a finding was supported or contradicted before you build on it.
Frequently asked questions
What are the best databases for a clinical literature review?
The credible minimum is PubMed/MEDLINE + Embase + Cochrane CENTRAL. Add Scopus or Web of Science for breadth, and use Google Scholar only as a supplement because its filters are weak and results are not reproducible.
What are the best AI tools for a literature review?
Research Rabbit and Semantic Scholar for discovery, AnswerThis for a referenced first draft and gap finding, Consensus for evidence agreement, Elicit for data extraction, and Scite to check whether a finding was supported or contradicted.
Is Google Scholar good enough for a literature review?
No — Google Scholar is broad but has weak filters, no reproducibility, and gameable citation counts. Use it as a supplement for grey literature, not as your primary search.
Can AI tools replace a systematic literature review?
No. AI tools speed up discovery, screening and synthesis, but a credible review still needs a documented, reproducible search across multiple databases and human judgement on quality and novelty.
What is Scite and why use it?
Scite analyses ‘Smart Citations’ across more than a billion citations to show whether a finding was supported, contradicted, or merely mentioned — so you don’t build on a result that was quietly refuted.