A typical cycle is 600mg Test E a week,600mg EQ a week and 150mg Tren A EOD. I still respond to the steroids like i did when when i was younger.
This is a heavy cycle if you consider the equivalent dose of raw testosterone, especially since Trenbolone is included.
I have heard of people being unable to get a benefit from Androgel after using high doses of injectables. So some form of downregulation must be occurring.
Another thing which seems to have a minor correlation is testosterone's impact on immunity. It appears to suppress the immune system (and vice-versa is true). If you remove the exogenous testosterone, the immune system reacts stronger than before and no longer suppresses as well as it did the previous time.