User blog comment:Fliu/Chapter 929: Jurassic Wano/@comment-3075024-20190101175736/@comment-38010659-20190101180838

Rumble Balls would then function the same as Energy Steroids, (What Hody ate in Fish-Man Island Arc)

But we don't know yet if there are any side-effects, Rumble Balls might just be for Chopper.