Frequently Asked Questions About Testosterone Replacement Therapy

Testosterone Replacement Therapy: 15 Questions,Answered

Medically reviewed by Timothy W. Mackey,D.O., Medical Director, NovaGenix Health & Wellness · Last reviewed August 2026

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Fatigue that doesn't lift with sleep. A libido that's quietly disappeared. Strength and body composition moving in a direction you didn't choose. Men often file these under aging — and sometimes that's exactly what they are. Sometimes they're lowtestosterone, and sometimes they're something else entirely, which is why theevaluation matters more than the assumption.

Below are thequestions patients at our Jupiter, Florida clinic ask most often, answereddirectly. None of this replaces a medical evaluation, and testosterone therapyis not appropriate for every man.

What is testosterone replacement therapy?

Testosteronereplacement therapy (TRT) is a prescription treatment that supplements testosterone in men whose bodies don't produce enough. It's used to treat hypogonadism — clinically low testosterone confirmed by blood testing —alongside symptoms. TRT is not a supplement, a booster, or a performanceenhancer. It's a monitored medical therapy.

Treatment atNovaGenix begins with a physical exam and laboratory testing, not aquestionnaire. Dr. Mackey reviews your symptoms, medical history, medicationsand lab results before determining whether treatment is appropriate. Some menwho come in expecting testosterone leave with a different diagnosis entirely —thyroid dysfunction, sleep apnea, and depression all produce overlappingsymptoms.

Learn more about testosterone replacement therapy at NovaGenix

Is TRT FDA-approved for age-related low testosterone?

No.FDA-approved testosterone products are indicated for hypogonadism resulting from established medical conditions — primary testicular failure or a problem with the pituitary or hypothalamus. Age-related testosterone decline on its ownis not an FDA-approved indication.

This is animportant distinction that many clinics blur. Treating age-related decline iscommon and defensible clinical practice, but it is prescribing outside thelabeled indication, and you deserve to know that before you start. The FDAhas issued specific guidance on this point. Dr. Mackey will discuss where your situation falls.

What testosterone level is considered low?

Most clinical guidelines use a total testosterone below 300 ng/dL as the threshold fortestosterone deficiency, confirmed on two separate morning blood draws.Reference ranges vary between laboratories and assay methods, so the number onyour report should be interpreted against that lab's range — not a number youread online.

A single lowresult is not a diagnosis. Testosterone follows a daily rhythm, peaks in themorning, and drops in response to acute illness, poor sleep, and stress. The American Urological Association guideline recommends confirming with a repeat morning measurement, and we follow that standard.

Free testosterone, SHBG, LH, FSH, and estradiol often matter as much as total testosterone. A man with a "normal" total testosterone and very highSHBG can still be functionally deficient.

Seehow NovaGenix tests for low testosterone

What are the symptoms of low testosterone?

The most commonly reported symptoms are reduced sex drive, erectile difficulty,persistent fatigue, loss of muscle mass and strength, increased body fat aroundthe midsection, irritability or low mood, difficulty concentrating, and poor sleep quality.

Symptoms men most often mention first

●       Low libido and reduced spontaneous erections

●       Fatigue that rest doesn't resolve

●       Loss of strength despite unchanged training

●       Increased abdominal fat

●       Irritability, low motivation, or depressed mood

●       Brain fog and reduced concentration

●       Poor sleep quality

●       Over time, reduced bone density

None of theseare specific to low testosterone. All of them appear in thyroid disease, sleep apnea, depression, anemia, and medication side effects. That's the entireargument for testing rather than guessing.

Readmore about low sex drive in men

Who is a candidate for TRT?

Men with symptoms of testosterone deficiency plus confirmed low testosterone on twomorning blood tests may be candidates. Candidacy also depends on your medical history, current medications, cardiovascular risk factors, prostate health, andwhether you're planning to father children in the near term.

A consultation does not guarantee a prescription. If your labs are normal, or if your symptoms point somewhere else, Dr. Mackey will say so and help you find the right nextstep.

Who should not take TRT?

Testosterone therapy is generally not appropriate for men with active prostate cancer ormale breast cancer, men actively trying to conceive, men with an elevated hematocrit, men with untreated severe obstructive sleep apnea, or men withuncontrolled heart failure.

Additionalcaution applies with a personal history of blood clots, significant lowerurinary tract symptoms, or an elevated PSA that hasn't been evaluated. This isone of the main reasons a physical exam and baseline bloodwork come before anyprescription — the Endocrine Society clinical practice guideline is explicit about the requiredpre-treatment workup.

How is TRT administered?

The most common methods are intramuscular or subcutaneous injections, topical gels and creams,transdermal patches, and subcutaneous pellets. Injections are the most widely used because they're cost-effective and produce predictable levels. The right method depends on your preference, lifestyle, absorption, and how consistentlyyou can adhere to it.

Comparing delivery methods

●       Injection (intramuscular or subcutaneous) —weekly or twice weekly. Predictable levels, lowest cost, requires self-injection.

●       Gel or cream — daily. No needles, but absorption varies and there is a transfer risk to partners and children.

●       Patch — daily. No needles; skin irritation iscommon.

●       Pellets — every three to six months. Convenient,but the dose cannot be adjusted once inserted.

Topical products carry a boxed warning regarding secondary exposure — testosterone cantransfer to a partner or child through skin contact. If you have young childrenat home, discuss this before choosing a topical.

What are the potential benefits of TRT?

In men with confirmed testosterone deficiency, treatment may improve libido, sexual function, energy, mood, lean muscle mass, bone density, and body composition.Response varies considerably between individuals, and some men see meaningfulimprovement in some areas and little change in others.

Two honestcaveats. First, the evidence is strongest for improvements in sexual functionand mood, and more variable for energy, cognition, and body composition.Second, testosterone therapy is not a weight-loss treatment, a fitnessshortcut, or a substitute for sleep, nutrition, and training. Patients whoaddress those alongside therapy do meaningfully better than those who don't.

Learn about medically supervised weight management at NovaGenix

What are the risks and side effects of TRT?

Like every prescription therapy, TRT carries real risks. The most common is an elevatedred blood cell count. Others include reduced fertility, acne and oily skin,fluid retention, worsening of existing sleep apnea, breast tenderness orenlargement, and injection site reactions.

Risks explained

●       Elevated red blood cell count (erythrocytosis) —the most common dose-limiting effect of testosterone therapy. Higher hematocritthickens the blood and increases clotting risk. This is why we check a complete blood count before starting and at every follow-up, and why dose reduction or atreatment pause is sometimes necessary.

●       Reduced fertility — TRT suppresses sperm production. See the fertility question below.

●       Testicular volume reduction — related tosuppression of your own production.

●       Acne and oily skin — common early, often improves as levels stabilize.

●       Fluid retention — usually mild; matters more ifyou have heart or kidney disease.

●       Worsening sleep apnea — testosterone canaggravate existing obstructive sleep apnea.

●       Breast tenderness or gynecomastia — related toconversion of testosterone to estradiol, which we monitor.

●       Injection site reactions — soreness, redness,occasional swelling.

Cardiovascular safety has been studied extensively. Large randomized trial evidence in menwith hypogonadism and elevated cardiovascular risk has been framed around non-inferiorityfor major adverse cardiac events — not demonstrated cardiovascular benefit.Testosterone therapy is not a treatment for heart disease, angina, or anemia,and should not be presented as one.

MayoClinic's overview of testosterone therapy risks is a useful second source.

How long does TRT take to work?

Most men notice changes in libido and mood within three to six weeks. Improvements in energy typically follow over one to three months. Changes in muscle mass, strength andbody composition develop more slowly, usually over three to six months, and cancontinue for a year or longer.

Timelines varywith your starting level, dose, delivery method, age, sleep, nutrition,training, and genetics. If you've seen no change at all by month three, that'sa signal to reassess the protocol — or to reconsider whether testosterone wasthe right explanation for your symptoms.

How often do I need bloodwork on TRT?

Expect baseline labs before starting, follow-up testing within the first few months, andmonitoring at regular intervals thereafter — typically around three to sixmonths after initiation and at least annually once you're stable. Dr. Mackeysets the interval based on your response, your dose, and your lab trends.

What we monitor and why

●       Total and free testosterone — confirms you arein range, neither too low nor too high.

●       Hematocrit and complete blood count — detects erythrocytosis, the most common dose-limiting effect.

●       Estradiol (sensitive assay) — tracks conversion;relevant to breast tenderness and mood.

●       PSA — prostate monitoring.

●       Comprehensive metabolic panel — liver, kidneyand electrolyte function.

●       TSH — rules out a thyroid contribution tosymptoms.

●       LH, FSH and SHBG — ordered when clinically indicated.

Monitoring isnot optional and it is not a revenue line. It is the mechanism by which testosterone therapy stays safe. Any provider willing to prescribe testosterone without ongoing bloodwork is not practicing responsibly.

Does TRT affect fertility?

Yes.Testosterone replacement therapy suppresses the body's production ofluteinizing hormone and follicle-stimulating hormone, which reduces sperm production and can cause temporary or, less commonly, prolonged infertility. Ifyou're planning to father children, discuss this before starting — other approaches may be more appropriate.

Options worth discussing include delaying therapy, using medications that raise testosterone without suppressing the pituitary signal, banking sperm beforehand, or addinghCG alongside testosterone to help maintain testicular function. hCG andenclomiphene are used off-label for this purpose. They can help preserve function in some patients, but they do not guarantee fertility preservation,and individual response varies.

Fertility oftenrecovers after stopping TRT, but recovery time is unpredictable and is notguaranteed. Bring this up at your first consultation — it is far easier to plan around than to correct afterward.

Learn about hCG therapy at NovaGenix

What happens if I stop TRT?

Testosteronelevels return toward where they were before treatment, and the symptoms that improved will generally return with them. Your body's own production issuppressed during therapy and takes time to recover — for some men weeks, forothers several months.

Stoppingabruptly can produce a period where your levels are lower than they were before treatment, because natural production hasn't restarted. If you want todiscontinue, do it with your physician so the taper and monitoring can bemanaged properly.

Is TRT safe long-term?

Forappropriately selected patients with confirmed deficiency, testosterone therapyhas an established safety profile when it is monitored. Long-term safety depends almost entirely on candidate selection, dosing to a physiologic range,and consistent laboratory follow-up.

The risks that matter over years — erythrocytosis, prostate monitoring, cardiovascular considerations — are managed through the bloodwork schedule above, not avoidedby hoping. This is why NovaGenix does not offer testosterone without a physical exam, baseline labs, and ongoing monitoring.

Does NovaGenix offer telehealth for TRT?

Sometimes.Availability depends on the state you live in, applicable telemedicine law, andwhether your situation can be appropriately evaluated remotely. Florida patients generally begin with an in-person visit that includes a physical examand laboratory testing.

Contact theoffice and we'll tell you honestly whether telehealth is appropriate for your situation, or whether you need to come in.

Start with our new patient forms

Does insurance cover TRT?

NovaGenix is aself-pay practice and does not bill insurance. Some insurance plans do cover testosterone therapy through in-network providers, typically requiring repeatedlab results below a set threshold and adherence to the plan's protocol.

If insurance coverage is your priority, contact your carrier directly about their requirements. If individualized dosing, direct physician access, and flexiblemonitoring matter more to you, self-pay is often the better fit. We'll give youclear pricing before you commit to anything.

How do I get started with TRT in Jupiter, Florida?

Call or text NovaGenix at 561-277-8260, or request a consultation online.We'll discuss your symptoms and goals, arrange laboratory testing, and schedule your evaluation with Dr. Mackey.

NovaGenix Health &Wellness

609 N. Hepburn Avenue, Suite 106

Jupiter, Florida 33458

ServingJupiter, Palm Beach Gardens, Tequesta, Juno Beach, North Palm Beach and Palm Beach County.

Men'shormone therapy  ·  Women'shormone therapy  ·  Medical weight loss  ·  Peptide therapy

About the author

Timothy W. Mackey,D.O. is the Medical Director of NovaGenix Health & Wellness inJupiter, Florida. He is a Florida-licensed osteopathic physician (licenseOS9185, NPI 1730235797) with internal medicine training, United States Armyservice, and more than two decades in clinical practice. His credentials can beindependently verified through the CMS NPIRegistry and the Florida Department of Health.

Medical disclaimer: This article isfor general educational purposes and does not provide medical advice,diagnosis, or treatment. Individual results vary. Treatment decisions requirean appropriate medical evaluation, and no therapy is suitable for every patient.

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