Low Testosterone: Do You Need TRT or Is There Something to Try First

Your testosterone is low. Now you have to decide what to do about it. And the answer depends entirely on one thing that most doctors either skip or never explain clearly: where in the chain the breakdown actually is.

Here is the full chain first, because without it, none of the rest makes sense.

Your brain contains a region called the hypothalamus, which releases a hormone that tells your pituitary gland to get to work. Your pituitary responds by releasing two hormones called LH and FSH, which are chemical signals that travel through your bloodstream to your testicles and tell them to produce testosterone. When testosterone levels rise, that signal feeds back to the brain and pituitary to slow down production. When levels drop, the signal ramps back up. The whole system is self-regulating, like a thermostat that controls a furnace by reading the temperature in the room.

When testosterone is low, the question is not just how low. The question is why low. And the answer is somewhere in that chain.

There are two possible breakdowns. Either the signal is not being sent, or the signal is being sent and the destination is not responding. These two scenarios look identical on a basic testosterone panel, but they require completely different solutions, and treating one like the other is where most guys end up either on a medication they did not need or stuck in a cycle of optimization that goes nowhere.

The way you tell them apart is straightforward. You look at LH and FSH alongside your testosterone, drawn in the morning when levels peak.

If your testosterone is low and your LH and FSH are also low or sitting in a low-normal range, the problem is in the signal. Your brain is not telling your pituitary to push hard enough, and your pituitary is not telling your testicles to produce. This is called secondary hypogonadism, meaning the failure is upstream, not in the testicles themselves. The testicles are often perfectly functional. They are just waiting for instructions that are not arriving.

This is a meaningfully different problem from what most people imagine when they think about low testosterone, because it means the manufacturing equipment is intact and the supply line is broken.

In this case, a class of medications called selective estrogen receptor modulators, which work by blocking estrogen's feedback signal at the brain and pituitary, can effectively trick the system into thinking testosterone is lower than it is, which causes LH and FSH to rise, which then drives the testicles to produce more testosterone on their own. The most studied option in this category is clomiphene citrate. A 2025 systematic review and meta-analysis covering ten randomized controlled trials and 819 patients found that clomiphene produced a mean increase in testosterone of 273.76 ng/dL, which is a substantial shift driven entirely by the body's own production rather than external hormone replacement.

A closely related compound called enclomiphene, which is the active isomer of clomiphene, appears to produce similar testosterone increases with a significantly better side effect profile. One study comparing the two in 66 hypogonadal men found that enclomiphene raised median testosterone by 166 ng/dL while producing side effects in only 13.8% of men, compared to 47% in the clomiphene group. The difference matters because clomiphene contains a second isomer that can have estrogen-like effects in some tissues, and enclomiphene removes that variable entirely.

Another option for secondary hypogonadism is HCG, something called human chorionic gonadotropin, which is a hormone that mimics LH directly at the level of the testicles. Rather than working upstream at the brain, it speaks the language the testicles are already listening for. This makes it particularly useful for men concerned about fertility because it keeps the testicles active and producing sperm, which standard TRT suppresses.

Now the other scenario. If your testosterone is low and your LH and FSH are already high, the picture is reversed. Your brain is doing its job and sending the signal as loudly as it can. The testicles are just not capable of responding adequately. This is called primary hypogonadism, and in this situation, the downstream equipment is the problem. You cannot fix that by amplifying the signal further. You cannot clomiphene or optimize your way out of it, because the signal is already maxed out. This is where TRT is the appropriate path, because you are replacing what the body cannot produce rather than stimulating a system that is already trying.

The fertility question comes up here too, and it is solvable. Research from Coviello and colleagues showed that 500 IU of HCG administered every other day was sufficient to maintain intratesticular testosterone at baseline levels in men whose gonadotropins had been suppressed by exogenous testosterone. Intratesticular testosterone is the local concentration inside the testicles that drives sperm production, and it is orders of magnitude higher than what shows up in a serum blood test. Keeping that concentration up is what preserves fertility while on TRT, and that dose appears to be enough to do it.

Before any of this matters, though, the foundations have to be there. Sleep deprivation measurably suppresses LH pulsatility. Excess body fat drives aromatization, which is the conversion of testosterone to estrogen, which feeds back to suppress the hypothalamic-pituitary signal. Chronic undereating does the same. If those variables are not addressed, you are trying to correct a hormonal readout without touching the upstream inputs driving it, and the number on the lab sheet will keep pulling you back in.

The broader point is that low testosterone is not one condition. It is two conditions with opposite mechanisms that happen to share a symptom. The distinction between them sits in a single set of labs that most people never ask for, and once you have that data, the decision is not complicated. The complexity was never in the solution. It was in knowing which solution you actually needed.

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References

1. Souza et al. 2025. "Clomiphene or enclomiphene citrate for the treatment of male hypogonadism: a systematic review and meta-analysis of randomized controlled trials." Archives of Endocrinology and Metabolism. 10 RCTs, 819 patients, mean increase 273.76 ng/dL. Source
2. Coviello AD et al. 2005. "Low-dose human chorionic gonadotropin maintains intratesticular testosterone in normal men with testosterone-induced gonadotropin suppression." JCEM. 500 IU EOD maintained intratesticular testosterone at baseline. Source
3. Saffati et al. 2024. "Safety and efficacy of enclomiphene and clomiphene for hypogonadal men." Translational Andrology and Urology. 66 men, enclomiphene median increase 166 ng/dL, side effects 13.8% vs 47% with clomiphene. Source

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