Low Testosterone: Do You Need TRT or Is There Something to Try First
Testosterone doesn't just appear. Your brain makes it happen, and that chain of command is the entire reason why two men can have the same low testosterone number on a lab report and need completely different solutions.
The chain works like this: your hypothalamus sends a signal to your pituitary gland, which responds by releasing two hormones called LH and FSH, which is short for luteinizing hormone and follicle-stimulating hormone. LH is the main driver here, traveling through the bloodstream to the testicles and telling them to produce testosterone. FSH handles sperm production. When everything is working, the testicles respond, testosterone rises, the brain senses that rise and eases off, and the system stays in balance. When testosterone is low, the question is never just "how low is it." The question is where in that chain did something break down.
That single question determines whether your testicles are the problem or whether your brain is.
When a doctor checks only testosterone and nothing else, you get a number without a diagnosis. The number tells you something is wrong. It does not tell you why. To understand why, you need LH and FSH drawn at the same time, ideally in the morning when testosterone is naturally at its peak, and what those two additional numbers reveal splits low testosterone into two completely different situations.
If your testosterone is low and your LH and FSH are also low, or even just in the normal range when they should be elevated in response to low testosterone, that pattern is called secondary hypogonadism. The testicles are not the problem. The signal upstream is the problem. Your brain is either not sending the message or sending it too quietly, and your testicles are sitting there waiting for a command that isn't coming. In most cases, they are perfectly capable of producing testosterone. They just need to be told to.
This matters because secondary hypogonadism is a category where going straight to TRT is often not the right first move.
Two medications are commonly used in this situation. The first is something called clomiphene citrate, which is a selective estrogen receptor modulator that works by blocking estrogen receptors in the brain so the hypothalamus perceives less feedback and responds by signaling the pituitary to release more LH. More LH means more signal to the testicles, and the testicles respond by making 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, which is a meaningful shift for a drug that works by correcting a signaling problem rather than replacing a hormone.
The second option is something called HCG, which is human chorionic gonadotropin, a hormone that mimics LH directly at the testicular level. Instead of fixing the signal from the brain, HCG bypasses the brain entirely and speaks directly to the testicles in a language they already understand. Because it works at the testicular level and preserves intratesticular testosterone, it also maintains sperm production in a way that TRT does not, which makes it relevant for men who are thinking about fertility.
Both of these approaches share the same logic: your body has the machinery, it just needs the right input.
Before committing to either one, the foundations matter more than most people want to hear. Sleep debt chronically suppresses testosterone. Carrying excess body fat increases aromatase activity, which is an enzyme that converts testosterone to estrogen, which then feeds back to suppress LH further. Chronic stress elevates cortisol, which competes with and suppresses testosterone production at multiple points in the chain. No medication corrects any of those mechanisms. If the foundations are not in place, the medication becomes a patch over a process that is still running in the wrong direction.
The other side of the lab result changes the picture entirely.
If your testosterone is low and your LH and FSH are both high, that is called primary hypogonadism. Your pituitary is doing its job. It senses low testosterone, it sends the maximum signal it can, and the testicles are not responding. The problem is at the testicular level itself. In this case, the clomiphene strategy does not work because the brain is already pushing as hard as it can, and asking it to push harder does not help. The downstream machinery is the failure point. This is the situation where TRT is the appropriate answer, not a shortcut, but the actual clinical solution.
For men on TRT who want to preserve fertility, the data on HCG is specific. A study by Coviello and colleagues found that 500 IU of HCG administered every other day was sufficient to maintain intratesticular testosterone at baseline levels in men whose gonadotropin production had been suppressed by exogenous testosterone. The relevance of intratesticular testosterone is that it is what drives sperm production, and external testosterone does not adequately reach the interior of the testicle. The HCG maintains that local testosterone environment even while TRT is suppressing the pituitary signal, which keeps the sperm production pathway functional.
One distinction worth knowing between the two medications used for secondary hypogonadism is that clomiphene and enclomiphene, which is a refined version of the same compound, do not behave identically. Clomiphene is a mixture of two isomers. Enclomiphene is the active isomer in isolation, and a 2024 study in 66 men found that enclomiphene produced a median testosterone increase of 166 ng/dL while only 13.8 percent of patients experienced side effects, compared to 47 percent with standard clomiphene. The difference is not trivial if tolerability is a concern.
Most men who feel something is off with their testosterone never get LH and FSH checked because it requires asking for them specifically. The standard workup often stops at total testosterone. That single oversight is what sends someone down a path that may not match the actual problem, whether that means starting TRT when a signaling drug would have worked, or spending months trying to optimize lifestyle factors when the testicles genuinely cannot respond regardless of input.
The lab result does not make the decision for you. But it makes sure the decision you make is pointed at the right thing.
References
- 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
- 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
- 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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