The best treatment for low testosterone depends on your age, symptoms, and whether you want to have children in the future. For most men, testosterone replacement therapy (TRT) is the standard treatment, and it comes in several forms: injections, topical gels, and implanted pellets. Men who want to preserve fertility have effective alternatives that boost the body’s own testosterone production instead. The right choice starts with confirming the diagnosis and understanding what each option actually involves.
How Low Testosterone Is Diagnosed
A diagnosis requires two things: symptoms that match testosterone deficiency and blood tests confirming consistently low levels. The Endocrine Society recommends measuring total testosterone from a fasting morning blood draw on two separate occasions, since levels fluctuate throughout the day and drop after eating. A single low reading isn’t enough.
The clinical threshold for low testosterone is generally 264 ng/dL, based on the CDC-harmonized standard for healthy young men. Some labs use a slightly different range, with Mayo Clinic Laboratories listing 240 to 950 ng/dL as the normal adult male reference. Free testosterone, the portion actively available to your tissues, declines naturally with age. A man in his 30s has a normal free testosterone range roughly twice as wide as a man in his 70s.
The symptoms most closely linked to low testosterone are sexual: reduced morning erections, low libido, and erectile dysfunction. In a large European study of middle-aged and older men, only these sexual symptoms showed a clear statistical association with levels below 320 ng/dL after adjusting for age. Fatigue, depressed mood, and loss of muscle mass are common complaints too, but they overlap with many other conditions, which is why bloodwork is essential.
Testosterone Replacement Therapy
TRT is the most direct treatment. It replaces the testosterone your body isn’t making with an external source. There are three main delivery methods, each with trade-offs in convenience, consistency, and cost.
Injections
Injections are the most widely used and least expensive option. Most men inject weekly or every two weeks, with typical doses ranging from 75 to 200 mg depending on the schedule. The main downside is that testosterone levels spike shortly after the injection and then gradually fall, creating peaks and valleys that some men notice as mood or energy swings toward the end of a cycle. Weekly injections smooth this out more than biweekly ones. Subcutaneous injections into the abdomen are also available as an alternative to the traditional intramuscular shot.
Topical Gels
Gels are applied once daily, usually in the morning, and deliver a steadier level of testosterone throughout the day. They’re easy to apply and simple to adjust if your dose needs to change. The main concern is skin-to-skin transfer: if a partner or child touches the application site before the gel has fully absorbed, they can be exposed to testosterone. This matters most for women and children, where even small amounts can cause unwanted hormonal effects. You’ll need to avoid showering or swimming for a set period after application.
Implanted Pellets
Pellets are small testosterone implants placed under the skin during a brief office procedure, typically every three to four months. They offer the longest gap between treatments, which appeals to men who don’t want to think about daily or weekly dosing. The trade-off is less flexibility. If you need to stop treatment or adjust the dose, the pellets have to be physically removed. There’s also a small risk of infection at the implant site or pellets working their way out.
Fertility-Preserving Alternatives
Standard TRT shuts down your body’s natural testosterone production, which also shuts down sperm production. For men who want children now or in the future, this is a serious consideration. Two alternatives work by stimulating your own hormonal system instead of replacing it.
Clomiphene citrate (commonly known as Clomid) blocks estrogen receptors in the brain, which tricks the body into ramping up its hormonal signals to the testes. The result is increased natural testosterone production while maintaining sperm output. Typical doses in clinical studies range from 25 mg daily to 50 mg every other day, adjusted to reach mid-normal testosterone levels. Studies show it effectively raises testosterone and can improve sperm concentration and motility at the same time.
Human chorionic gonadotropin (HCG) works through a different mechanism, directly stimulating the testes to produce testosterone. It’s sometimes used alone or combined with clomiphene. Research comparing the two found that both raised testosterone levels significantly, though neither showed a clear advantage over the other. These options are prescribed off-label for male hypogonadism, meaning they’re not FDA-approved specifically for this use but are well-established in clinical practice.
When to Expect Results
Testosterone treatment doesn’t produce overnight changes. Different symptoms improve on different timelines, and knowing what to expect helps you stick with treatment long enough to see results.
Sexual interest is often the first thing to improve, typically appearing within three weeks and plateauing around six weeks. Mood changes, particularly improvements in depressive symptoms, take longer to emerge, usually becoming noticeable at three to six weeks and reaching their full effect at about four to seven months. Body composition shifts are the slowest: changes in fat mass, lean muscle, and strength begin around 12 to 16 weeks, stabilize at six to 12 months, and can continue improving marginally for years.
If you’ve been on treatment for several months without noticeable improvement, your doctor may need to recheck your levels and adjust the dose or delivery method.
Monitoring and Side Effects
TRT requires ongoing blood work, especially in the first year. The most important marker to watch is hematocrit, a measure of how concentrated your red blood cells are. Testosterone stimulates red blood cell production, and if hematocrit rises above 52%, it increases the risk of blood clots. At that point, treatment typically involves donating blood (therapeutic phlebotomy) and possibly adjusting your testosterone dose. Hematocrit is usually checked every three to six months during the first year and annually after that.
For men over 50, or younger men with risk factors for prostate cancer, PSA levels (a prostate health marker) should be monitored regularly. TRT raises PSA by an average of about 0.30 ng/mL, with slightly larger increases in older men. A significant or rapid rise warrants further investigation, but routine monitoring keeps this manageable. Blood pressure should also be checked periodically, since TRT can contribute to increases in some men.
Cardiovascular Safety
For years, there was genuine uncertainty about whether testosterone therapy increased the risk of heart attacks and strokes. The TRAVERSE trial, the largest and most rigorous study to address this question, provided a clear answer. In men with hypogonadism who already had cardiovascular disease or were at high risk for it, TRT did not increase the rate of heart attacks, strokes, or cardiovascular death compared to placebo. There was actually a small, non-significant reduction in deaths in the testosterone group, with 16 fewer deaths than the placebo group. The trial also found no increase in prostate cancer events.
This doesn’t mean TRT is risk-free for every man, but it does mean that cardiovascular concerns alone are not a reason to avoid treatment when it’s genuinely needed.
Who Should Not Use TRT
TRT is contraindicated in men with untreated prostate cancer or breast cancer. Men considered high-risk for prostate cancer, including those with a first-degree relative who had it and African American men with a PSA above 3 ng/mL, need careful evaluation before starting treatment. Sleep apnea is a relative contraindication: if you already have it, TRT may worsen your symptoms, so treatment for the sleep apnea itself should be in place first.
Men who are actively trying to conceive should avoid standard TRT entirely, since it suppresses sperm production, sometimes to zero. Recovery of fertility after stopping TRT is possible but not guaranteed and can take months. This is where clomiphene or HCG become the preferred approach.