Is there any evidence that tren is toxic to the kidneys? Your urine color is not what I'm looking for... That could be caused by multiple things and does not necessarily mean it's hurting your kidneys.
There is a tremendous amount of evidence that every single steroid is toxic to a certain degree. The ideology of skipping the first pass by injecting is non-toxic is a mere myth. Everything you consume, regardless of the delivery method is passed via the kidney. A second pass is obviously more scarring.
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I would definitely say tren is toxic on the kidneys and liver. Obviously you should use the same amount of caution for your health while taking any steroid. But it is pretty obvious tren has more toxicity than most steroids out their. So I would recommend doing everything in one's power to stay healthy while taking it. Bro science or not I don't want to be the one to find out its toxic and be in the one kidney club with Flex Wheeler.
There are studies, not on humans, however. But you don't need a study to prove this. I'm not sure what a study would yield. Are you looking for the exact mechanism in which a steroid can scar/damage/enlarge the liver? If so, I can provide immense details outlining the journey in its entirety that results in liver damage.
All steroids disrupt the CNS to some degree. I agree, that trenbolone is far more active in that arena.
Blood work is key here. Many steroid users are looking for signs that the liver may be distressed. Unfortunately, 75% of a human liver can be destroyed and inoperable with little to no symptoms in some cases.