Creatine is common among people who've maxed out their beginner gains but who are still chasing PRs. You get a fair bit of it naturally in food, and it's been studied to death by nearly every sports medicine program in the world: https://my.clevelandclinic.org/health/treatments/17674-creat...

Creatine will let you push an 8 rep set to 9 or 10. And when every pound on the bar is bought with two weeks of complicated periodization, that little bit helps. And creatine is allowed by basically every athletic league.

Real PEDs are a whole different ball game. Much bigger risks.

I think most people would count anything not forbidden for Olympic athletes as natty (not that most Olympic athletes actually are, but that's another discussion).