I experienced dramatic and obvious hair loss in my late twenties after starting creatine supplementation. I'm talking hundreds of hairs coming out every shower. It stopped when I stopped creatine. No I didn't make any other changes in diet or lifestyle at the time. I hadn't even heard of the link before that. This is actually one of those things that made me start doubting "the science" in general because it's supposedly not true, but, it obviously is true for my head beyond a reasonable doubt.