In order to find peer -reviewed journals in CINAHL, you can look at the CINAHL with Full Text Database Coverage List. If there is a Y in the column for Peer-Reviewed, then the journal has been peer-reviewed.
You can also limit your results in CINAHL to peer-reviewed articles. Conduct your search in CINAHL. Underneath the search table, go to the Limit To box located in the left sidebar and click on show more.
In the new window, click on the checkmark box next to peer review and then click on search. Your results will be limited to articles from peer-reviewed journals.