Researchers explain: When can you really rely on a scientific study?

In social media, large numbers of claims about the corona virus are disseminated, and in many cases these claims refer to a scientific study.

For example, a study may indicate that vitamin D may have beneficial effects on people who have covid-19 disease, leading to calls for consuming high doses of vitamin D to begin to be shared on various social platforms.

But what does it mean that a single study indicates something?

Helena Nordenstedt is a researcher and teacher of global health at Karolinska Institutet - see her in this video above!