One study is a data point. Strong evidence comes from many studies agreeing, ideally including well-run randomized trials.
Ask
Was it in humans? How many people? How big was the effect? Was it randomized? Who funded it? Has it been repeated?
Mouse ≠ you
Lab and animal findings often don't translate to people.
Evidence & sources
Confidence in evidence depends on study design, consistency, precision and risk of bias across all studies. Evidence: established. Known: The GRADE framework, used by WHO and many guideline bodies. Unknown: — Source: GRADE Working Group (Guyatt et al., BMJ), GRADE: an emerging consensus on rating quality of evidence (2008).