Most of the journals in Medline/PubMed are peer-reviewed. Generally speaking, if you find a journal citation in Medline/PubMed you should be just fine. There is no way to limit your results within PubMed to knock out the few publications that are not considered referred titles.
There is concern within the scholarly community that predatory journal titles have found their way into citation databases like Pubmed. Please be aware that the PubMed interface contains citations from PubMed Central and the NIH Pre-prints, two sources of citations that contain journal publications or articles which have not met peer review processes.
To learn more, read:
Duc NM, Hiep DV, Thong PM, et al. Predatory Open Access Journals are Indexed in Reputable Databases: a Revisiting Issue or an Unsolved Problem. Med Arch. 2020;74(4):318-322. doi:10.5455/medarh.2020.74.318-322
Anderson, K. A Confusion of Journals — What Is PubMed Now? The Scholarly Kitchen. Published September 7, 2017. Accessed October 8, 2021.
Please ask a librarian for help if you are concerned about a specific title.