HCG will stim testes
Hcg, aka human chorionic gonadatropin will stimulate the testicles to make testosterone
It works because part of the HCG molecule is idenitcal to part of the lh molecule. Lh is the normal signal from the brain to the testicles to make more testosterone. The injections are usually given 1 -2 time per week, but can be given in smaller doses daily.