Good post and info. I never knew that tren messed with your breathing and cardio. I was always so focused on the other side effects like anger issues and night sweats and generally just feeling like crap while on it, I just thought it must be me slacking off or allergies that would cause this more so on tren. What a wonderful and terrible drug all in one. I assume tren-a is the main culprit. Or does this hold true for tren-e and tren-hex as well?