I had the same question awhile back, but haven't attracted any response.
The reason I had asked about this is that so many people who have used
testosterone experience shut-down of the HPTA, sometimes for a long time. I gather that this is mostly younger men who have taken much higher dosages than you would ordinarily use for
TRT (I'm injecting 100 mg
test E every 5 days). Since I'm older (67) I wondered whether my age might make me more susceptible to HPTA shut-down, even at this relatively low dose, should I ever have to stop
TRT (e.g., because of polycythemia, etc.) I wondered whether periodic respites might restart my HPTA, and avoid extended or permanent shut-down in the event I have to stop
TRT some day.
My serum
testosterone before
TRT wasn't 'officially' hypogonadal (it was around 450) but I had strong signs of androlpause anyway. The
TRT has been extremely effective. I also wonder, though, whether I'm not driving my serum T up too high (over 800 ng/DL 5 days after injection, range is 200-1000). Free
test also high, outside 'normal' range), around 50. Am I taking too high a dosage? I don't aromatize all that much, estradiol is 30 ( a good number, optimal thought to be 20-30).
Thanks for following up on this question.