The consensus of this forum it that HCG should be started before the Leydig cells stop producing testosterone(before atrophy). I have read that one can greatly benefit from starting HCG by the last 3-4 weeks of the cycle.
HCG is suppressive and therefore should not be run post cycle. HCG mimics LH, when there is excess LH the pituitary gland will not produce LH. Why would one want to suppress the pituitary gland when one trying to recover natural body function?