What does "research use only" actually mean here?

It's both, honestly. It's legal framing and the actual culture here.

In practice it means the site won't hand you a dose or tell you to take anything — it'll tell you what the evidence shows and how to judge a source. The decisions, and the legality where you live, stay on you.

Yep. People here answer "what does the study say," not "what should you inject." Once that clicked, the whole place made more sense to me.