Yet more interesting info from the web:
Do anabolic steroids cause kidney damage?
There is no known toxic effect of anabolic steroids on the kidneys. However, one study showed that long-term use of anabolic steroids decreased the amount of anabolic steroids excreted in the urine.(1) At the same time, the excretion of corticosteroids was not affected.(1) It is unknown why this
decrease in anabolic steroid excretion occurs.(1)No one knows whether the steroids not excreted by the kidneys
accumulate in the body or are excreted in the feces.(1)
REFERENCES
1. Harrison LM, Martin D, Gotlin RW, Fennessey PV. Effect of extended use of single anabolic steroids on urinary steroid excretion and metabolism. J Chromatogr 1989;489:121-6.

Do anabolic steroids cause kidney damage?
There is no known toxic effect of anabolic steroids on the kidneys. However, one study showed that long-term use of anabolic steroids decreased the amount of anabolic steroids excreted in the urine.(1) At the same time, the excretion of corticosteroids was not affected.(1) It is unknown why this
decrease in anabolic steroid excretion occurs.(1)No one knows whether the steroids not excreted by the kidneys
accumulate in the body or are excreted in the feces.(1)
REFERENCES
1. Harrison LM, Martin D, Gotlin RW, Fennessey PV. Effect of extended use of single anabolic steroids on urinary steroid excretion and metabolism. J Chromatogr 1989;489:121-6.


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