My limited experience with trebolone, tells me that the kidney/urine issue must be from the kit. Here's why:
I have only used Ttokkyo's Tren 75, assuming that it is real tren, I never had any urine issues shooting 1 cc ed, for 6 weeks. The only people I hear the problem from are those who are buying Fina and converting it at home. Don't get me wrong, it's a whole lot cheaper that way, I will be doing it myself this spring, but like I said, no troubles at all with the Tren-75. Although it did kill my sex drive, for a VERY long time, even with 250m of sust a week.