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

Testosterone levels don't tell you much on their own. They tell you what is happening, but not where the problem is. And without knowing where the problem is, you can't know which solution actually applies to you.

Here is the full chain first, because everything else depends on it.

Your brain contains a region called the hypothalamus, which monitors your hormone levels and sends a signal down to your pituitary gland. The pituitary responds by releasing two hormones called LH and FSH, which are essentially chemical messages that travel through the bloodstream to your testicles and tell them to produce testosterone. Your testicles respond, testosterone rises, the hypothalamus detects that, and it dials the signal back down. The whole thing runs like a thermostat, constantly adjusting to keep levels in range.

When testosterone is low, something has gone wrong in that chain. The only question is where.

That question is answered by looking at LH and FSH in the same blood draw as your testosterone, ideally in the morning when levels are at their peak. Those two numbers tell you whether the problem lives in the brain or in the testicles, and that distinction determines everything about what you do next.

If your testosterone is low and your LH and FSH are also low, or even just normal when they should be elevated, the problem is above the testicles. Your brain is not sending the signal with enough force. The testicles are receiving weak instructions and producing accordingly. This is called secondary hypogonadism, which means the testicular machinery is likely intact, it just is not getting the command it needs. Think of it like a factory that is fully functional but the manager stopped sending orders. The factory is not broken. It is just sitting idle.

This matters because it means there is something to try before committing to replacing the hormone externally.

One option is something called clomiphene citrate, which is a selective estrogen receptor modulator that blocks estrogen's feedback signal at the hypothalamus and pituitary, which causes the brain to interpret low estrogen as a sign that it needs to push harder, which increases LH and FSH output, which drives the testicles to produce more testosterone on their own. A 2025 systematic review and meta-analysis covering 10 randomized controlled trials and 819 patients found that clomiphene produced a mean testosterone increase of 273.76 ng/dL. That is a meaningful lift through stimulation rather than replacement, and it leaves the body's own production intact.

There is also a newer version called enclomiphene, which is the active isomer of clomiphene without the inactive isomer that is thought to drive most of the side effects. A 2024 study of 66 men found that enclomiphene produced a median testosterone increase of 166 ng/dL with a side effect rate of 13.8 percent, compared to 47 percent with standard clomiphene. The testosterone gains were somewhat lower but the tolerability was substantially better, and both drugs preserve fertility because they work through your own hormonal axis rather than bypassing it.

HCG is another tool in this space. It mimics LH directly, which causes the testicles to produce testosterone without relying on the pituitary signal. It also maintains sperm production because the same LH-mimicking action that drives testosterone synthesis also supports the cells involved in spermatogenesis.

All of this only makes sense when LH and FSH are low or inappropriately normal. If those numbers are already high, the interpretation is completely different.

High LH and FSH alongside low testosterone means the brain is already screaming at the testicles as loud as it can and the testicles are not responding adequately. This is called primary hypogonadism, and it means the machinery itself is the problem. Stimulating the system further with clomiphene or HCG will not produce meaningful results because the signal is already maxed out. In this case, testosterone replacement is the appropriate path because you are not bypassing a working system, you are supplementing a system that genuinely cannot meet demand.

The fertility concern that often comes up with TRT is real and worth understanding. When you introduce testosterone from an external source, the hypothalamus detects elevated levels and reduces its LH and FSH output, which causes the testicles to stop producing their own testosterone and reduces sperm production. This is the mechanism behind TRT's contraceptive effect in some men. The way to preserve fertility on TRT is to add HCG alongside it, because HCG continues to provide the LH-like signal directly to the testicles, maintaining intratesticular testosterone and sperm production even when the pituitary has gone quiet. A 2005 study by Coviello and colleagues found that 500 IU of HCG every other day was sufficient to maintain intratesticular testosterone at baseline levels in men whose gonadotropins had been suppressed, which is why that specific dose shows up in clinical practice so often.

None of this works in isolation from the basics. Sleep deprivation reduces testosterone. Excess body fat increases aromatization, which converts testosterone to estrogen, which suppresses LH through that same feedback loop. Resistance training drives testosterone. Chronic stress elevates cortisol, which directly suppresses testicular function. If those inputs are disordered, a drug intervention becomes a way of patching over a system that is being actively degraded, and the numbers on the lab sheet improve while the underlying problem continues.

The reason this all matters is that testosterone replacement is a long commitment. Once you start, the feedback loop that was suppressing your production gets further suppressed, your natural production may decline further, and the process of coming back off becomes its own clinical challenge. That is not an argument against TRT when it is the right tool. It is an argument for knowing whether it is the right tool before you reach for it.

LH and FSH are cheap labs. They take a few minutes to add to a standard testosterone panel. And the answer they give you closes the gap between "my testosterone is low" and "here is what I should actually do about it." That is the whole point.

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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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