hCG
most data
The Dose Guy’s verdictSep 1, 20263 sources
If you are running anything suppressive, hCG is how you keep your testes alive while you are on. It mimics LH, the signal your pituitary stops sending when exogenous hormones are in the picture, so your testes keep producing testosterone and sperm instead of shutting down and shrinking. That means faster, smoother recovery when you come off. It is not a standalone PCT drug, it actually suppresses your own LH through negative feedback, but as an on-cycle and pre-PCT tool it is close to non-negotiable.
What it is
hCG is a glycoprotein hormone, the same one a pregnancy test detects, and it binds your LH receptor directly. When you are on a cycle, your pituitary sees exogenous testosterone or a SARM and stops producing LH because it thinks you have plenty. Without LH, your Leydig cells go dormant, your testes shrink, and sperm production stalls. hCG steps in as a substitute LH signal: it keeps the Leydig cells active, maintains intratesticular testosterone, and preserves testicular volume and fertility while the natural signal is offline.
The distinction matters for PCT. A SERM like tamoxifen or enclomiphene restarts your own LH production from the top of the axis. hCG works from the bottom, directly stimulating the testes. You want both: hCG on cycle to prevent the damage, the SERM after to restart the signal. Running hCG as your only PCT suppresses your own LH further, which is the opposite of recovery.
What the research shows
The evidence base is clinical, built on hypogonadotropic hypogonadism and fertility, not on men coming off cycles. The mechanism transfers cleanly, though no PCT-specific randomized trial exists:
Yes, most people recover on their own eventually. The reason hCG still earns its place: recovery speed, fertility odds, and not betting you are in the lucky majority who bounce back fast with everything intact.
Realistic protocols
Most people pin hCG subcutaneously, though intramuscular works too. Reconstitute with bacteriostatic water and store in the fridge. It loses potency at room temperature, so keep your vials cold and use them within a few weeks of mixing.
The on-cycle protocol is straightforward: 250 to 500 IU two to three times per week, starting from week one of the cycle and running throughout. This keeps testicular volume and function intact so recovery is not starting from zero. You do not need high doses. More hCG means more intratesticular estrogen, and past a point you are just creating estrogen management problems without additional benefit.
For the pre-PCT bridge, if you did not run hCG on cycle, a short blast of 1000 to 1500 IU every other day for about 10 days wakes the testes back up before you start your SERM. This is not ideal, on-cycle use is better, but it rescues some testicular function before the restart.
Do not run hCG as standalone PCT. It mimics LH but suppresses your own LH production through negative feedback. Use it to prime the testes, then hand off to a SERM to restart the natural signal.
Side effects
Well tolerated at the doses people actually run. Most sides track to the testosterone and estrogen hCG produces:
