How to Use hCG on TRT for Fertility (Protocol Breakdown)
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The hCG Dose That Preserves Fertility on TRT: 500 IU Three Times Per Week
Most of the hCG dosing advice floating around is either copied off a bodybuilding forum or handed down from a clinic that never explained why the number is the number. So before touching dosage, the chain has to make sense.
Your brain, specifically the hypothalamus and the pituitary, sends out two signals to your testicles. One is luteinizing hormone, or LH, which tells the Leydig cells in your testicles to make testosterone. The other is follicle stimulating hormone, FSH, which drives the Sertoli cells to actually produce sperm.
When you inject testosterone, your brain reads the high level in your blood and shuts the signal down, so LH drops and FSH drops right along with it. Testicles stop getting the message and over months they shrink, and sperm production slows or stops entirely.
The silence downstream of the testosterone, not the testosterone itself, is the whole problem.
The molecule is close enough in shape to LH that it binds the same receptor on the Leydig cell, so from the testicle's point of view the message never stopped arriving. The brain is still quiet, but the testicle doesn't know that.
Think of LH as a key and the Leydig cell receptor as a lock. hCG is a slightly different key cut to the same lock, and it fits. It also stays in circulation longer than LH does, which is why you don't need daily dosing.
Recommended dose and days to take hCG. For somebody who's doing like a therapeutic, we'll say fertility preservation protocol for hCG, a typical protocol that I suggest for people is somewhere around 500 IU three times per week.
And that usually does a really good job of keeping the LH within a healthy range and keeping the testicles large and functioning.
The three times per week spacing matters more than people realize, because hCG has a half life measured in roughly a day and a half, so dosing Monday, Wednesday, Friday keeps a reasonably steady signal at the receptor instead of a spike and a long gap.
Testicular size is your rough feedback loop here. Not because size itself is the goal, but because the Leydig and Sertoli cells make up most of that volume, so when the testicle holds its size on TRT, it's a signal the tissue is still being driven.
Some people go higher depending upon if you're being treated for some type of fertility, but I would definitely look to go lower.
The reason to start low is that hCG stimulates the Leydig cell directly, and the Leydig cell also runs aromatase, the enzyme that converts testosterone into estradiol. Push the dose up and you can get intratesticular estrogen rising faster than anything useful, which shows up as water retention, mood swings, or nipple sensitivity.
High doses over long periods can also desensitize the receptor, which is the opposite of what you're paying for.
And then if you're not seeing the response that you wanna see from it, you can incrementally increase from there. But about 1500 IU per week is a typical starting dosage for hCG.
Add 100 to 200 IU per injection at a time, hold that dose for six to eight weeks, and then look at what changed, because sperm takes roughly 70 to 90 days to go from early cell to mature, so you cannot judge a fertility response in two weeks.
If you're actively trying to conceive and hCG alone isn't restoring sperm counts, the usual culprit is an FSH problem rather than an LH one, and hCG doesn't cover FSH. That's a conversation about adding something like HMG or FSH directly, with a physician running semen analyses.
Most of what I know about this came out of conversations in the free community, so if you want the rest of it and somewhere to ask, the men's group is here: https://www.skool.com/jh-iron-forge-brotherhood/about
If this is the kind of information you want access to on a daily basis, the community is free and there are full courses on training, nutrition, hormones, and supplementation inside. You can ask questions and post your own labs and get feedback from me and from the community.