Syntheses resources are those that systematically and reproducibly find a comprehensive body of evidence, critically analyze it, and synthesize it down into recommendations for changes in practice, map a topic, or identify areas for further research. Examples are: systematic reviews, scoping reviews, and rapid reviews. The gold standard for evidence syntheses in clinical medicine are systematic reviews put out by the Cochrane. Always read evidence synthesis research with a critical lens - many do not use robust methods.
Maintained by the Cochran Collaboration and contains multiple resources, including the Cochrane Database of Systematic Reviews. Cochrane Reviews are systematic reviews of primary research in human health care and health policy. They investigate the effects of interventions for prevention, treatment, and rehabilitation, as well as assess the accuracy of a diagnostic test for a given condition in a specific patient group and setting.
JBI EBP Database contains a unique suite of information to help healthcare professionals with evidence-based practice, including systematic reviews, evidence summaries, best practice information sheets, and evidence-based recommended practices.
To find systematic reviews in PubMed you must use the systematic review "article type" filter. It is found on the left side of the search results - click it to narrow your search to this subset. If you have used the "clinical queries" option previously note that it no longer has a systematic review subset.