Good thing I also mentioned doctors, who are, of course, applying the concluded result of research. But maybe you are talking about another "medical context".

I threw your "vitamin D supplementation proved beneficial" into Google and this Nature review article on vitamin D supplementation was the first result:

* https://www.nature.com/articles/s41574-021-00593-z

Here is some additional reading you may find interesting:

* https://en.wikipedia.org/wiki/Ad_hominem