Quick and detailed explanation: Human Chorionic Gonadotropin (hCG) is a fertility drug that mimics the actions of luteinizing hormone. It is commonly used during the post-cycle period to address testicular atrophy, which as we have seen is one of the fundamental roadblocks to hormonal recovery. The hCG is typically taken at a substantial dosage for a period of 2-3 weeks. Testicular atrophy is caused by a lack of LH stimulation, and likewise recovery is function of increased LH. The objective with hCG is to maximize stimulation of the testes so their original mass is recovered more quickly than if we relied solely on physiological LH production.
^^^Credits go to William Llewellyn and his Anabolics 10th edition book. (Which I constantly read)
TO DUMB IT DOWN: it basically brings your balls back and makes easier for recovery (if used during cycle; mostly a long or heavy cycle) and also helps on trying to kickstart test production when levels take a dive during PCT.
So it should of been a really good idea to research HCG before running a cycle for 12 months but anyway. What is your PCT looking like? Are you asking for the usage of Nolvadex during cycle or during PCT?
Always, always have everything needed for a cycle before hand..