The evidence is convergent. Multiple independent sources reach the same conclusion, the underlying mechanism is well-characterized, and even the field's most cautious voices treat it as worth doing.
When men take exogenous, meaning from outside the body, testosterone, either by cream or by patch or by pellets or more typically by injection-- the most typical TRT approach nowadays is testosterone cypionate, which is biologically identical to the kind of testosterone you would make. Well, because of negative feedback loops, which you also learned about earlier, the testicles themselves shut down their own testosterone production.
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So if you have exogenous testosterone so like you're administering it yourself synthetically you have basically told your brain I have enough estrogen and testosterone via this injection I'm doing or whatever it is. So you cannot produce any more G&RH cuz like why would we need you to? We have enough hormone. It's like okay well let's turn that off. Let's turn off as a result we have no signal to produce pituitary hormones or the the ginadotropen.in. So we turn that off and now you have no signaling to your testes. So now you're just like literal organ uh atrophy is occurring because there's no signaling happening there.