BabeintheWoods said...
1. It eventually stops producing your natural testosterone. If you are on artificial hormones long enough then your body may permanently have lower capacity to produce it naturally.
2. Your body may try to balance the high levels of test by producing high levels of estrogen to even things out. This is one of the unintended consequences for many body builders who have used steroids and testosterone to build muscle. The increased estrogen can develop mammary glands in men. Very common in body building circles and is referred to as "b*tch t*ts". You don't want that.
1a-That's called 'shutdown' and to get the testes going again there is something for that too called PCT - post cycle therapy. In fact the current trend is to take HCG while on hormone replacement therapy, which prevents them from atrophy and keeps them producing. If your on HRT then you do not have a Post cycle therapy because it never ends. Many males over 50 have more estrogen circulating than their wives, T drops every year you get older.
2-"try to balance the high levels of test by producing high levels of estrogen". That is not what happens. Testosterone is broken down in males into estradiol. Adding exognous testosterone will obviously result in more being broken down into more Estradiol than before. There are mitigations for that too.
"Estradiol is also present in males, being produced as an active metabolic product of testosterone"
en.wikipedia.org/wiki/EstradiolHormone Replacement Therapy - HRT should not be confused with abusing anabolic steroids. One is like a glass of wine with dinner while the other is more akin to full blown binge drinking.