Yea. i am not sure about its toxicity on the kidneys, it has been a few months since ive reviewed my anabolic library(stacks of journals, transcribed japaneese research unknown to most, other hard to find tidbits, organic reference databases etc. ). From what i have been reading on the anabolic board people are extracting this substance from the agricultural products, they are using solvents and if they make it themselves chances are it is not a pure product of what they inject into their bodies( not sterile and may/will contain impurituies) this sets the individual up for health problems, I cant remember off the top of my head if trenbolone by itself is toxic to the kidneys directly, indirectly maybe if there is fluid volume excess secondary to increased protien synthesis(excess anabolism and/or catabolism creates a shift in water production/electrolyte balance efect the renal system, cardiopulmonary system( someone who has CHF, COPD have an exacerbation when increased fluid volumes are present. they come to the ER give them lasix) Basicly summing up this. {Increases in fluid can cause problems for the body. Anabolics can cause fluid imbalances and hypertension which can cause renal problems. Non sterile product may cause bacteremia/ and Nephrotoxic conditions. I can go on all day about why not to inject yourself with anything that did not come from a real pharmacy.