Yes—research papers in Nature are peer reviewed; news, opinion, and editorials are not.

No, not every Elsevier journal or article type is peer-reviewed; check each title’s Guide for Authors to confirm the review model.

Yes, research and most scholarly content in The BMJ and BMJ journals undergo peer review, with The BMJ using an open model for research papers.

Yes, JAMA articles are evaluated through external peer review and editorial checks before publication.

No, Cleveland Clinic’s consumer health articles are medically reviewed, while its Cleveland Clinic Journal of Medicine uses formal peer review.

Yes, most Cochrane reviews are dependable syntheses, built on strict methods, transparent bias checks, and regular updates when new trials appear.

Yes, Mayo Clinic journal articles are peer reviewed, but consumer health pages are medically reviewed, not journal-peer-reviewed.

No—NIH content spans peer-reviewed studies, author manuscripts, and preprints; only journal articles go through peer review.

No, NIH-linked content isn’t all peer reviewed; PubMed and PMC host many peer-reviewed papers, but news, policies, and preprints vary.

No, NLM doesn’t peer-review articles; many records link to peer-reviewed journals, while some content and preprints are not.