The study was done on older men with no apparent past use of anabolics.
Also, I have a feeling that giving DHT to men with failing testicular function can actually boost testosterone levels, or at least maintain the same testosterone levels (in the low range) but increase sense of well being, libido, etc.
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I don't understand what "side-effects of failures" means. Do you mean like, if someone doesn't recover testicular function after a cycle?