TRT Clinics Are Selling You Hormonal Chaos

The liver makes IGF-1. That is not a controversial statement, and almost everyone in the performance space knows it. What most people do not know is what actually tells the liver to make it, and that gap in understanding is costing people real money while making their hormones worse.

Start with the full chain so you have a map.

Your hypothalamus releases something called GHRH, which is growth hormone releasing hormone, and that signal travels to your pituitary gland and tells it to pulse out growth hormone. Growth hormone then travels through the blood to the liver, and the liver converts it into something called IGF-1, which stands for insulin-like growth factor 1, and IGF-1 is the molecule that actually does the work at the tissue level, building muscle, supporting recovery, regulating metabolism. Growth hormone is the messenger. IGF-1 is the action.

That chain only works correctly when your sex hormones are doing their job.

Estrogen is what primes the liver to respond to growth hormone in the first place. Specifically, estrogen upregulates something called growth hormone receptors on liver cells, which are the binding sites that allow growth hormone to signal the liver to produce IGF-1. Without enough estrogen, you can have perfectly normal growth hormone output from your pituitary and the liver will still underconvert it. The growth hormone shows up, but the liver is not listening.

This is where TRT clinics create the problem they then charge you to solve.

A man starts testosterone replacement therapy. His testosterone goes up, and through a natural process called aromatization, where an enzyme converts testosterone into estradiol, his estrogen goes up too. A lot of clinics treat rising estrogen as an emergency. They prescribe anastrozole, which is an aromatase inhibitor, something that blocks that conversion enzyme and drives estrogen down.

The problem is that estrogen was not the problem. It was doing its job.

When you crash estrogen with anastrozole, you pull the support structure out from under your IGF-1 production. Studies in men have shown that estrogen suppression significantly reduces circulating IGF-1 levels even when growth hormone secretion remains unchanged. The growth hormone is still pulsing out normally, but the liver has lost the signal it needs to respond. You end up with more growth hormone in the blood and less IGF-1 in the tissue. That is the opposite of what anyone is paying for.

Now the clinic has a problem. The patient feels worse, his recovery is poor, his body composition is not improving, and his IGF-1 levels on labs are low. So the clinic sells the next product.

IGF-1 peptides, or direct IGF-1 itself, are now offered as the solution. And this is where the business model becomes visible because the solution being sold is a direct consequence of the intervention the clinic already performed. They suppressed estrogen, which reduced IGF-1, and now they are selling you a peptide to replace the IGF-1 that their protocol eliminated.

This is not a coincidence. It is the architecture of the upsell.

The medical standard for IGF-1 therapy is worth understanding here because it clarifies how far outside normal clinical practice this is. Actual IGF-1 replacement therapy, which uses a drug called mecasermin, is indicated for something called primary IGF-1 deficiency, which is a condition where the pituitary and growth hormone axis function normally but the body cannot produce IGF-1 due to a genetic defect in growth hormone receptors. This condition is so rare that it affects roughly one in a million people. The clinical guidelines for its use require documented severe IGF-1 deficiency, confirmed normal growth hormone output, and failure of the axis at the receptor level, not the lifestyle or hormonal management level.

A man whose IGF-1 is low because his estrogen was suppressed by anastrozole does not have primary IGF-1 deficiency. He has an iatrogenic problem, which means a problem caused by the treatment itself. The fix is removing the cause, not adding another drug downstream.

The reason the cascade compounds is that estrogen suppression does not only affect IGF-1. Estrogen plays a role in bone density, cardiovascular health, libido, cognitive function, and mood stability in men. When a clinic aggressively manages estrogen downward, those systems all degrade together, and each symptom can be used to justify another prescription. Low libido becomes an argument for more testosterone. Mood issues become an argument for other compounds. What started as a single hormonal intervention becomes a stack of patches, each one addressing a side effect of the last.

The foundational error is treating estrogen as the enemy of testosterone therapy rather than as part of the same system.

A properly optimized testosterone axis in a man produces a predictable and natural rise in estradiol alongside testosterone. That estradiol supports mood, protects the cardiovascular system, maintains bone, and critically, keeps the liver sensitized to growth hormone so that IGF-1 production stays high. Anastrozole is a legitimate clinical tool in specific situations, like in men with extremely high estrogen causing gynecomastia or genuinely supraphysiologic levels, but using it as a routine part of TRT to keep estrogen in what some clinics call the "optimal male range" is not supported by evidence and directly undermines the goals of the therapy.

If your IGF-1 is low and you are on testosterone therapy and your clinic has you on an aromatase inhibitor, the question is not whether to add a peptide. The question is whether you still need the anastrozole at all.

Removing the suppression and letting estrogen rise to a physiologically appropriate level will often restore IGF-1 on its own because the axis was never broken. It was being blocked. The system was trying to work correctly the entire time, and the intervention was the thing stopping it.

Testosterone, estrogen, and IGF-1 are not separate levers you pull independently. They are one system, and every time you pull one lever you move the others. The clinics selling you anastrozole and then IGF-1 are not optimizing the system. They are charging you to experience the consequences of their own interference.

---

Join the free community:
Men: Iron Forge Brotherhood
Women: Powerhouse Fitness