Unlike in the humanities, "review" in the sciences doesn't mean a "book review" or judgement of a particular resource.
In the sciences, review articles (sometimes called literature reviews or secondary sources) synthesize or analyze research already conducted in primary sources (original research). They generally summarize the current state of research on a given topic.
So searching for review articles is often just searching for scholarly, often peer-reviewed journal articles. You can also search more specifically with limiters for reviews, systematic reviews, or meta-analysis.
A general academic database with a majority of the articles in full text. Contains podcasts and transcripts from NPR, CNN, and the CBC, as well as full-text New York Times content 1985 to present.
Provides full text for nearly 3,970 journals covering the social sciences, humanities, general science, multi-cultural studies, education, and much more.
Google Scholar allows you to cross search scholarly literature across many disciplines.
Coverage of Applied & General Science: Physics, Engineering, Astronomy, Biology, Earth Science, Chemistry, and more. Coverage: 1986-present, 965 of 1145 journals available in full-text.
Also unlike in the humanities, primary sources are not diaries, artwork, or 1st hand accounts.
In the sciences, primary sources (also called research articles or empirical articles) report on original research. They will typically include sections such as an introduction, methods, results, and discussion.
The databases often provide a search limiter of methodology, research article, or empirical study.
If they do not have the limiter, use the words study, clinical-trial, or case-study, as a search term:
Comprehensive international coverage of scholarly literature in psychology. Includes articles from more than 1300 periodicals in over 25 languages.
For full text, set Source to Subscribed journals
Provides full text for nearly 3,970 journals covering the social sciences, humanities, general science, multi-cultural studies, education, and much more.