Cochrane Library contains high-quality, independent evidence to inform healthcare decision-making. It includes reliable evidence from Cochrane and other systematic reviews, clinical trials, and more. Cochrane reviews bring you the combined results of the world’s best medical research studies, and are recognized as the gold standard in evidence-based health care.
** Dynamed Search for a topic or browse more than 3000 topics. Physician written summaries include evidence that is rated 1, 2 or 3 based on the quality of evidence available for a recommendation. Recommendations are graded A, B, or C based on the quality of the evidence available.
** Clinical Key ClinicalKey is a clinical resource from Elsevier that includes journals, books, practice guidelines, patient education, drugs, multimedia, instructional videos of medical of procedures and more.
** Natural Medicines Comprehensive Database is an evidence-based source of information on the ingredients, interactions, effectiveness, and use of brand name natural products and substances. Products are graded effective to ineffective using evidence based reviews of the literature.
UpToDate offers evidence grading. 1 or 2 indicates the strength of the recommendation, A/B/C indicates the grade for the quality of the evidence used.