Cochrane Database of Systematic Reviews plus:
Cochrane Methodology Register (CMR)
Cochrane Central Register of Controlled Trials (CENTRAL)
Database of Abstracts of Reviews of Effects (DARE)
Health Technology Assessment Database (HTA)
NHS Economic Evaluation Database (EED)
JCR allows you to evaluate and compare journals (e.g., most frequently cited journals and highest impact journals in a field) using citation data drawn from over 7,500 scholarly and technical journals.
Natural Medicines provides high quality, evidence-based information on dietary supplements (including herbs, vitamins, and minerals), functional foods, diets, complementary practices (modalities), exercises, and medical conditions.