Can long term use create an immunity.........?

[Lunk1]

I don't think the answer is that cut and dry. But i do I think the short answer is yes, to a certain degree. Otherwise, how do you explain guys like Marcus or Titan who require huge doses to see results?
I believe a certain amount of tolerance builds up over time. BUT, Lunk does bring up a very good point about TRT patents. Perhaps this only applys to large quantity use?

Just a thought..

I think now your speaking more about levels required to maintain growth that exceeds genetic limits...not neccessarily immunity (if we want to use that word).