I think it's the benezol alcohol content in the gear that harms the kidneys. The thing that got me thinking this is a friend made me home-made fina/tren ace from cattle implants. I told him exactly how to make it, but he screwed up and made the benezol alcohol 40% of the total solution. After using it for awhile my urine test came back with blood in it and highly abnormal results. I recently googled kidney damage and benezol alcohol. A rat study came up proving that b.a. kills the kidneys in high dose. The reason I checked off tren in the poll here is because it's difficult to convert cattle implants to injection without using around a 20% b.a./b.b. solution. Any less and the implants don't dissolve.