In CINAHL, you can narrow your search results to evidence-based practice on the main search screen. This is under the 3 search boxes. Checking the box by Evidence-Based Practice will show only EBP articles. You can also check randomized controlled trials or select the type of research under the Publication Type dropdown if you want to get more specific:
In Nursing & Allied Health, you can narrow your search results to evidence-based practice on the main search screen. This is under the 2 search boxes. Under Document Type, checking the box by Evidence Based Healthcare will show only EBP articles. You can also select Scholarly Journals as the source type and narrow by age group and language: