Is it true? Yes and no, and it depends.
If you replace your bodies natural testosterone your body will stop making it, true. Eventually you will notice testicular atrophy from this, it usually happens so slowly you wont notice much of it unless you are on for a good few months.
What you mays notice is reduced output, and if you were tested at worst azoospermia, which is very low sperm count.
When you come off if you recouperate properly yes you can get your balls back, this has been done in people who have been on for 5 years but the therapy is pretty long and hardcore compared to keeping your balls in the first place.
HCG and HMG can be used when the sh!t is really bad and can bring you back, but HCG by itself will do most of that job. 500iu twice a week while on cycle I know has gotten at least one woman pregnant from someone who was in the 4th month of his cycle, so this occasional talk of testosterone being an effective contraceptive is a bunch of bull.
HCG can also be used post cycle, but it would be better to AVOID the problem than try to fix the problem, fixing something thats broken always takes longer. HCG should be run either during the cycle or with an anti-aromatase or anti-estrogen because it will spike both test and estrogen levels. HCG is also used in women but it works differently, it is an LH stimulator. HMG is an FSH stimulator and I haven't seen it available without great expense.
HCG + nolvadex will do most of the job for anybody. Nolvadex + clomid can also be run and is shown to work better for LH/FSH than either one alone.
I do know someone on another site who has a permanently atrophied left testicle and he has not been able to bring it back from the dead. His natural test level is in the 400s though, so he is doing "ok," but if you let the problem get bad then you are asking for trouble.
