Exactly, Low T / Hypogonadism can be caused by either primary (testicles not producing enough because of some idiopathic reason or injury or even mumps) or secondary reasons (pituitary gland which is located in the brain not releasing hormones that would in turn signal the testicles to produce T). When trying to figure out whether its primary or secondary one has to measure FSH and LH levels, low meaning brain doesnt produce enough, high meaning brain produces a lot but testicles dont work as good. Mine was average so that was kinda weird, you gotta measure LH and FSH multiple times to get the clear picture. Brain contrast MRI didnt show up anything. If there was a pituitary tumor, thats the easy part actually since around 3-5% of the population has it but it is super undiagnosed since a lot of people dont have any symptoms, its very benign. Basically you take this pill called cabergoline for a few months, boom tumor gone and your T will spike up again. But otherwise you would have to do TRT, and add HCG to it if you want to preserve your fertility. But you have to watch out and get a really good doc or two, and research yourself on the subreddit and ask questions. Recently my coffee habits skyrocketed which plummeted my SHBG which literally destroyed my T again even though I am on TRT. If I didnt educate myself enough on this matter I wouldve probably given up and thought it doesnt work. You gotta watch out of SHBG and E2 while on it. Once you get everything right literally its a gamechanger, I mean anything is achieveable not kidding. There was also a guest on Joe Rogans podcast that started a nonprofit after he had uncurable depression and he was on the verge of killing himself and some doc found out he had hypogonadism and within a month the depression was gone, and since then he staretd a nonprofit for it and saved around 200 lives that way. If there was a Testosterone ETF I will go long on that with all my money...