Including HCG as part of a hormone replacement therapy (HRT) program is superior to relying on testosterone alone if maintenance of sperm production and/or normal testicle size is considered important. Use of testosterone alone can result in infertility or reduced fertility, as normal testicular function depends on higher intratesticular testosterone levels than results from such use.
With regard to steroid usage, HCG should either not be used as part of post-cycle therapy (PCT) at all, or should be used only in a rather precise manner to avoid impeding recovery, shortly to be described.
Post-cycle recovery of LH production requires androgen levels to have fallen back into the physiological range. With use of medium or long-acting esters, this is a slow process. For example, let’s suppose that a given testosterone ester’s half-life is 7 days, and that 800 mg/week was used during the cycle. If so, then one week after the last injection, levels will be similar to what they would be if 400 mg had been taken weekly for some time, and with another 400 mg having just been injected. At the two week point after the last injection, levels will be commensurate with ongoing 200 mg/week use.