I get "overtraining" by the end of almost every semester. No amount of gear can stop it.
What causes overtraining (for me)?
Overuse of stims all semester
Increasing lack of sleep (no amount of naps can clear this up, I've tried)
Continuing to train hard and not back off
Stress piling up
And then wham...injuries coming round, perpetually tired, stims not working anymore, can't grow or get stronger. In this scenario, lifting is just piling on top the "stress" accumulating in my life. There is no reversal till the end of the semester, so I typically drop training volume and try and just maintain so that I don't lose anything, and then come out the hole at the end and sleep my ass off combined with d/cing all stims and about 2-3 weeks later I start feeling alive again.
I had this exact same thing happen before in an overworked job where I did 20+hrs OT weekly for months on end.
But then I see the exact opposite thing happen in summers: No school, much less stim use, much more sleep, giant lack of stress...I make good gains even on cruise dosages.
So I think overtraining itself is very hard to do if all other factors in your life are controlled for, but when your stress levels are high you can easily wind up in an adrenally fatigued state.