Regarding HCG and Clomid, not sure if it works but
@Sides and myself are sure that HMG is necessary, especially if u used harsh dosages or if u use gear since years!
I wouldn't say that HMG is necessary for everybody. Everyone is an individual. For guys who haven't been on gear that long, or have done cycles with breaks in between, or who have used HCG to maintain fertility even when they were on steroids, many of them can certainly recover only using HCG. Some guys can recover their fertility just going off all gear and taking nothing. And some guys could get their wives/girlfriends pregnant even on a heavy cycle of Tren and Deca, although for most that would be unlikely. But everyone's an individual when it comes to gear use and their response to it.
However, simply put, your body needs two things to make sperm. You need LH to stimulate the Leydig cells of the testicles, which raises your levels of intra-testicular testosterone and does 20% of the work in making sperm. And you need FSH to stimulate the Sertoli cells of the testicles, which do 80% of the work in making sperm.
HCG is a long-acting analog for LH, so as long as you are taking a reasonable amount of HCG, you will be adequately stimulating the Leydig cells. But HCG does nothing for your FSH levels and stimulating the Sertoli cells. If FSH is low, then to raise FSH, you either need to go off all gear and take Clomid, or stay on gear and take HMG or recombinant FSH to stimulate the Sertoli cells for optimum fertility.
Test + HCG + either HMG or FSH is a great combination for long-time gear users like myself who are azoospermatic (zero sperm count) and desire to regain their fertility.
It certainly worked for me, even at the age of 52 after 28 years of using steroids, and now I have my 11-month-old baby daughter keeping me up all night and causing me to get no sleep LOL. But she is a blessing, and I wouldn't trade her for anything in the world. And I didn't even have to go off test to make my wife pregnant, just added in HCG and HMG.
So that is what I would recommend to other men who are long-term gear users in the same position.