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

Most men who find out their testosterone is low get handed one of two options: start TRT or try to optimize their lifestyle harder. But that framing skips the actual question, which is why is the testosterone low in the first place, and the answer to that question is what determines which path makes sense.

To understand why that matters, you need the full chain first.

Your brain contains a region called the hypothalamus, which monitors your hormone levels the way a thermostat monitors temperature, and when it detects that testosterone has dropped, it releases a signaling hormone that tells the pituitary gland to act. The pituitary then releases two hormones called LH and FSH, which stands for luteinizing hormone and follicle stimulating hormone, and these travel through the bloodstream to the testicles. LH specifically is what triggers the testicles to produce testosterone. FSH drives sperm production. The testicles respond, testosterone goes up, the hypothalamus detects it, and the signal quiets back down. That loop runs continuously.

So when testosterone is low, something in that chain has broken. The question is where.

This is why a testosterone number alone tells you almost nothing. A man with a total testosterone of 250 ng/dL might have a brain that is barely signaling, or a brain that is screaming at full volume and getting no response. The treatment for those two situations is completely different, and treating them the same way is where a lot of guys end up either over-medicated or stuck.

You find the answer with a morning blood draw that measures LH and FSH alongside total testosterone.

If your testosterone is low and your LH and FSH are also low or normal, that pattern is called secondary hypogonadism, and the name tells you what it means. The problem is secondary to the testicles, meaning it originates higher up in the chain at the brain or pituitary. The testicles themselves are often completely functional, they just are not receiving an adequate signal to do anything.

This is the scenario where intervening at the level of the signal makes sense before committing to testosterone replacement.

One approach is something called clomiphene citrate, which is a selective estrogen receptor modulator that blocks estrogen receptors in the hypothalamus and pituitary, and because those receptors being activated is part of what tells the brain to quiet the signal, blocking them causes the brain to increase its output of LH and FSH, which then drives the testicles to produce more testosterone on their own. A 2025 systematic review and meta-analysis across 10 randomized controlled trials and 819 patients found that clomiphene produced a mean testosterone increase of roughly 274 ng/dL, which is a meaningful clinical shift without any exogenous testosterone entering the body.

The practical advantage of this is that your own production stays intact, your testicles stay active, and your fertility is preserved, which matters significantly to men who may want children.

The tradeoff worth knowing about is that clomiphene has two active components, and one of them called zuclomiphene tends to produce more side effects because it behaves more like estrogen. A 2024 study of 66 hypogonadal men found that the standard clomiphene formulation produced side effects in about 47 percent of men, while enclomiphene, which isolates only the more favorable component, produced side effects in around 14 percent of men, with a median testosterone increase of 166 ng/dL in the enclomiphene group. So the mechanism is the same but the tolerability profile differs.

The other tool worth understanding for secondary hypogonadism is HCG, which stands for human chorionic gonadotropin and is a hormone that structurally mimics LH closely enough that the testicles respond to it the same way they would respond to the real signal from the pituitary. This directly stimulates testicular testosterone production without requiring the brain to initiate anything.

Now here is where it is worth slowing down, because none of these options work in a vacuum.

If the foundations of sleep, nutrition, and resistance training are not in place, they are the most common drivers of suppressed LH and FSH in otherwise healthy men, and no drug that amplifies a broken signal is going to fix a lifestyle that keeps suppressing it. These interventions work best when they are correcting a genuine hormonal deficit, not compensating for chronic stress, poor sleep, obesity, or metabolic dysfunction that is pulling the whole system down.

The second scenario is the one where those options do not apply.

If your testosterone is low and your LH and FSH are already elevated, that pattern is called primary hypogonadism. Your brain and pituitary are doing exactly what they should be doing, they are already signaling hard, and the testicles are not responding. In this case, trying to amplify the signal further with clomiphene accomplishes little because the signal is not the problem. The testicular tissue itself cannot produce adequately, and testosterone replacement is the appropriate path.

The one question that comes up most often in this group is what happens to fertility on TRT, because exogenous testosterone suppresses LH and FSH through that same feedback loop, which means the testicles stop being stimulated and sperm production falls substantially in most men.

This is where HCG functions differently than it does in the secondary scenario. Adding HCG at around 500 IU every other day while on TRT maintains something called intratesticular testosterone, which is the testosterone concentration inside the testicle itself rather than in circulation, and that intratesticular concentration is what drives sperm production. A study by Coviello and colleagues found that this dose was sufficient to maintain intratesticular testosterone at baseline levels even while circulating testosterone and LH were suppressed by exogenous administration. The testicles stay active and sperm production is preserved.

The whole framework comes down to this: two men with the same testosterone number can require completely opposite interventions, and the lab result that separates them is the one most providers do not order without being asked.

Low LH and FSH with low testosterone means the signal is the problem, and the solution is to restore or amplify the signal while ensuring the lifestyle foundation is solid. High LH and FSH with low testosterone means the hardware is the problem, and the solution is to replace what the hardware cannot make.

The number on the lab sheet is just a symptom. The LH and FSH are the diagnosis.

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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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