Low testosterone is treated through a combination of lifestyle changes and, when those aren’t enough, medical therapy that raises hormone levels back into a normal range. The standard diagnostic cutoff is a total testosterone level below 300 ng/dL, confirmed by two separate blood draws taken in the early morning. Treatment only begins when low levels are paired with actual symptoms, so a number alone isn’t enough to start therapy.
How Low Testosterone Is Diagnosed
A single blood test isn’t sufficient. The American Urological Association recommends two total testosterone measurements on separate days, both drawn in the early morning when levels naturally peak. If both come back below 300 ng/dL and you have symptoms, that’s when a clinical diagnosis is made.
The symptoms fall into three broad categories. Physical signs include persistent fatigue, reduced endurance, loss of lean muscle mass, increased body fat, thinning body hair, and reduced beard growth. Cognitive symptoms can look a lot like depression: low motivation, poor concentration, memory problems, and irritability. Sexual symptoms are often what drive men to get tested in the first place, including reduced sex drive and weaker erections. Many of these overlap with other conditions like thyroid problems, depression, or sleep disorders, which is why bloodwork is essential before assuming testosterone is the issue.
Lifestyle Changes That Move the Needle
Before jumping to medication, lifestyle factors deserve serious attention. For men who are overweight, losing weight through a balanced diet and regular exercise can boost testosterone production by up to 30%. That’s a meaningful increase, sometimes enough to push levels back above the threshold without any prescriptions.
Resistance training produces the largest improvements, particularly moderate- to high-intensity exercises targeting large muscle groups. Think squats, deadlifts, and bench presses rather than bicep curls. Compound movements that challenge multiple joints recruit more muscle and generate a stronger hormonal response.
Sleep is the other major lever. Aim for seven to nine hours of quality sleep per night. Testosterone production is tightly linked to sleep cycles, and chronic sleep deprivation can suppress levels significantly. If you’re sleeping five or six hours a night and wondering why your testosterone is low, that’s the first thing to fix.
Correcting nutritional deficiencies also matters. Zinc and vitamin D both play roles in testosterone production, and supplementing them when you’re deficient can help. A typical supplementation protocol uses around 1,000 IU of vitamin D and 12 mg of zinc daily, though the benefit comes from correcting a deficiency rather than megadosing when your levels are already normal.
Testosterone Replacement Therapy Options
When lifestyle changes aren’t enough, testosterone replacement therapy (TRT) is the standard medical treatment. The goal is to bring your levels back into the normal range, not to push them as high as possible. Several delivery methods exist, and the right one depends on your preferences, lifestyle, and how your body responds.
Topical gels are applied to the skin daily, usually on the shoulders or upper arms. They maintain relatively steady hormone levels throughout the day, but you need to avoid skin-to-skin contact with others (especially women and children) until the gel dries completely, since testosterone can transfer through touch. Injectable testosterone is administered into a large muscle, typically the thigh or buttock, on a weekly or biweekly schedule. Many men learn to self-inject at home. Injections tend to create more of a peak-and-trough pattern, where levels are highest right after the injection and lowest just before the next one. Some men notice this fluctuation in their energy and mood.
Subcutaneous pellets are another option. A clinician implants small pellets under the skin every few months, providing a slow, steady release. Patches exist as well, though they’re less commonly used due to skin irritation.
What to Expect After Starting Treatment
TRT doesn’t produce overnight results. The timeline is gradual, and different symptoms respond at different speeds.
In the first two weeks, some men notice subtle improvements in motivation and focus, along with a reduction in fatigue and irritability. Libido may begin to increase slightly, but it’s rarely dramatic this early. By weeks three and four, stress tolerance typically improves, and many men report the return of morning erections and increased sexual interest.
The five- to eight-week range is where mood stabilizes more noticeably. Energy feels more consistent day to day rather than coming in waves. Sexual desire and erectile function continue to improve. Around weeks seven and eight, early body composition changes start to appear. Clothes may fit differently around the waist and chest, even if the scale hasn’t moved much.
By weeks nine through twelve, the mood and libido benefits level off at a new, stronger baseline with fewer fluctuations. Body composition changes in fat mass and lean muscle become more visible around week twelve, though they continue to develop and stabilize over six to twelve months. If you’re not seeing improvements by the three-month mark, your clinician will likely reassess your dosing or delivery method.
Fertility Is a Critical Consideration
This is one of the most important things men need to understand before starting TRT: testosterone replacement therapy suppresses sperm production. When you introduce testosterone from an outside source, your brain detects the elevated levels and stops sending the signals that tell your testes to produce both testosterone and sperm. For men who want children now or in the future, this is a serious concern.
Alternatives exist specifically for this situation. Clomiphene citrate is a medication that works by blocking estrogen receptors in the brain, which tricks the body into ramping up its own testosterone production while preserving (or even improving) sperm output. It’s taken as a pill, typically 50 mg every other day, and has been shown to raise testosterone levels in men with low hormones. Another option is human chorionic gonadotropin (hCG), which mimics the brain signal that stimulates the testes directly. Some clinicians use hCG alongside TRT to maintain testicular function and fertility.
If you’re a man of reproductive age considering treatment for low testosterone, make sure your provider knows your fertility goals before writing a prescription. Roughly one in four urologists have prescribed testosterone to men with infertility, despite it acting as a contraceptive, so this is worth bringing up explicitly.
Risks and Monitoring
TRT is generally well tolerated, but it carries real risks that require ongoing monitoring. One of the most common effects is an increase in red blood cell production. While a modest increase is harmless, too many red blood cells thicken the blood and raise the risk of clotting. Regular blood work catches this early.
Cardiovascular risk has been a subject of debate. The Endocrine Society has cautioned against using TRT in men with a history of coronary artery disease. If you have existing heart disease or significant cardiovascular risk factors, your provider will weigh the benefits against this concern carefully.
Prostate health is another area that requires attention. While the older fear that testosterone directly causes prostate cancer has largely been dialed back, men on TRT still need regular prostate screening. Sleep apnea can also worsen on testosterone therapy, so if you snore heavily or wake up feeling unrested, that’s worth mentioning before starting treatment.
Most guidelines recommend blood work within the first few months of starting therapy and then at regular intervals. These checks monitor your testosterone levels (to confirm the dose is right), red blood cell count, and prostate markers. Skipping follow-up labs is one of the most common mistakes men make on TRT.