Treatment for low testosterone typically involves testosterone replacement therapy (TRT), which delivers testosterone through injections, skin gels, patches, or implanted pellets. The goal is to bring levels back above 300 ng/dL, the threshold most medical organizations use to diagnose the condition. Before starting any form of replacement, though, lifestyle changes like better sleep and strength training can meaningfully raise testosterone on their own, and some men respond well enough to avoid medication entirely.
How Low Testosterone Is Diagnosed
A total testosterone level below 300 ng/dL is the widely accepted cutoff supporting a diagnosis of low testosterone, though different medical societies use thresholds ranging from 230 to 350 ng/dL. Because testosterone fluctuates throughout the day, blood is drawn in the morning when levels peak. Most guidelines require at least two separate morning blood draws showing low levels before confirming a diagnosis.
Numbers alone aren’t enough. You also need symptoms: low sex drive, fatigue, difficulty concentrating, loss of muscle mass, increased body fat, or depressed mood. A man with levels of 280 ng/dL who feels fine is in a different situation than one at 310 ng/dL who can barely get through the afternoon. Treatment decisions weigh both the lab results and how you actually feel.
Lifestyle Changes That Raise Testosterone
Before jumping to medication, several lifestyle factors directly influence testosterone production and are worth addressing first, especially if your levels are only mildly low.
Sleep: Seven to nine hours of quality sleep per night supports healthy hormone production. Even modest sleep deprivation, consistently getting five or six hours, can suppress testosterone significantly. If you snore heavily or wake feeling unrested, untreated sleep apnea may be dragging your levels down.
Resistance training: Lifting weights is one of the most reliable natural testosterone boosters. The largest improvements come from moderate to high intensity exercises targeting large muscle groups: squats, deadlifts, bench presses. Consistent training matters more than any single session.
Diet and body fat: Excess body fat actively converts testosterone into estrogen, creating a cycle that pushes levels lower. Losing weight, particularly abdominal fat, can raise testosterone substantially. Diets rich in healthy fats (fatty fish, extra virgin olive oil), lean protein, and nutrient-dense fruits and vegetables support testosterone production. Crash dieting, on the other hand, can temporarily suppress it.
Testosterone Replacement Therapy Options
When lifestyle changes aren’t enough, TRT delivers testosterone directly. Several delivery methods exist, and the best choice depends on your preferences, lifestyle, and how your body responds.
Injections
Injections are the most common and least expensive option. Testosterone cypionate is injected deep into the gluteal muscle every two to four weeks, with doses ranging from 50 to 400 mg depending on your response. Some men prefer more frequent, smaller injections to keep levels steadier and avoid the “peak and valley” effect where energy and mood swing between injection days. A subcutaneous version uses an autoinjector that you press into abdominal skin once weekly, which many men find easier to self-administer than a traditional intramuscular shot.
Topical Gels and Solutions
Gels are applied daily to the shoulders, upper arms, or stomach area, depending on the specific product. They absorb through the skin and maintain relatively steady testosterone levels throughout the day. The main drawback is transfer risk: if someone touches the application site before it dries, they can absorb testosterone through their own skin. This is a particular concern around children and female partners. You need to wash your hands thoroughly after application and keep the area covered.
Patches
A transdermal patch is applied once daily, usually in the evening, to the back, abdomen, upper arms, or thighs. Patches provide consistent delivery but can cause skin irritation at the application site. You should rotate where you place them and avoid bony areas or spots that get compressed while sitting or sleeping.
Implantable Pellets
Small pellets are inserted under the skin in the hip or another fatty area during a brief office procedure. Each pellet contains 75 mg of testosterone, and multiple pellets are placed at once. They dissolve slowly over three to six months, providing steady levels without daily or weekly maintenance. The trade-off is that once they’re in, you can’t easily adjust the dose if side effects appear.
What to Expect After Starting Treatment
TRT isn’t an overnight fix. Changes unfold gradually over weeks and months, and most men notice meaningful differences between weeks 8 and 12.
In the first two weeks, you may feel a subtle lift in afternoon energy and a slight reduction in fatigue and irritability. By weeks three and four, energy tends to become more consistent throughout the day, stress feels more manageable, and morning erections and sexual interest often improve. Weeks five and six bring more noticeable gains in energy, motivation, and sexual function, along with better workout recovery if you’re training.
Around weeks seven and eight, many men see the first visible body composition changes. Clothes may fit differently around the waist and chest. By weeks nine through twelve, strength training performance typically climbs, and fat loss paired with lean muscle gain begins to take shape. Full stabilization of body composition changes takes six to twelve months of consistent treatment.
These timelines assume your dose is dialed in correctly. Many men need one or two adjustments in the first few months based on follow-up blood work and how they feel.
Monitoring and Follow-Up Blood Work
Starting TRT isn’t a set-it-and-forget-it decision. Standard monitoring includes blood work at three months and six months after starting, then annually once levels are stable. These checks track your testosterone level (to confirm you’re in a healthy range), your red blood cell concentration (hematocrit), and prostate-specific antigen (PSA). A digital rectal exam is also part of early follow-up visits.
Hematocrit monitoring matters because testosterone stimulates red blood cell production. If your blood becomes too thick, it raises the risk of clotting. A hematocrit above 54% is a reason to pause or adjust treatment. PSA levels sometimes rise after starting TRT, which can lead to additional prostate screening. Current evidence does not show that TRT causes prostate cancer, but higher PSA readings may lead to biopsies that detect cancers that would have otherwise gone unnoticed.
Side Effects and Safety Concerns
Common side effects include acne, oily skin, fluid retention, and breast tenderness or mild swelling. Increased red blood cell production is the most medically significant routine side effect, which is why regular blood work is essential.
For years, the biggest concern around TRT was cardiovascular risk. A landmark trial of over 5,200 men aged 45 to 80, all with pre-existing heart disease or high cardiovascular risk, put this question to rest. The rate of heart attack, stroke, and cardiovascular death was 7% in the testosterone group and 7.3% in the placebo group, showing no increased overall cardiovascular risk. However, the testosterone group did have a higher incidence of pulmonary embolism, blood clots in the lungs, as well as atrial fibrillation and acute kidney injury. These remain important risks to discuss before starting treatment.
TRT is not appropriate for everyone. Active prostate cancer, breast cancer, and a hematocrit already above 54% are absolute reasons not to start. Uncontrolled heart failure, untreated obstructive sleep apnea, and severe urinary symptoms from an enlarged prostate are also reasons to hold off until those conditions are managed.
TRT and Fertility
This is one of the most important things to understand before starting treatment: testosterone therapy typically causes very low sperm counts or no sperm at all. Adding testosterone from the outside signals your brain to stop telling the testes to produce it, and sperm production shuts down along with it.
If you want to have children now or in the future, standard TRT is a poor choice. The good news is that once testosterone is stopped, sperm production generally returns within about three months, and no permanent damage is expected. For men who need both symptom relief and preserved fertility, alternative medications exist. Clomiphene citrate is a pill that lowers estrogen signaling in the brain, which indirectly boosts the body’s own testosterone and sperm production. Injectable hormones that mimic the brain’s natural signals to the testes can also maintain sperm output while raising testosterone levels. These alternatives should be discussed before any prescription is written for a man of reproductive age.