Testosterone Replacement Therapy
For men who are genuinely deficient — and only for them.
Where erectile dysfunction sits alongside biochemically confirmed hypogonadism, correcting testosterone can restore libido, energy and treatment response. Where it does not, testosterone is the wrong tool.
- Diagnosis
- Two morning blood draws
- Routes
- Injection, gel, pellet
- First reassessment
- 8–12 weeks
- Monitoring
- Ongoing, lifelong
01Overview
Low testosterone has become the most over-diagnosed and over-treated condition in men's health. Clinics prescribe it on the basis of a single afternoon blood draw, or on symptoms alone, or on no test whatsoever. We do not.
Diagnosis requires at least two separate morning blood samples — testosterone follows a daily rhythm and a late-day reading is close to meaningless — interpreted alongside LH, FSH, SHBG, prolactin, a full blood count and a metabolic panel. That workup also matters because it occasionally uncovers something more consequential than low testosterone, such as a pituitary lesion or untreated thyroid disease.
When a man is genuinely deficient, replacement can be transformative for libido, mood, energy, muscle mass and bone density. Its direct effect on the mechanics of erection is real but more modest than advertising implies, and it works best in combination with the treatments above rather than instead of them.
There is one more conversation we always have first. Testosterone suppresses sperm production, sometimes durably. If you may want children, we discuss alternatives such as clomiphene or hCG-based protocols before anything is prescribed — not after.
02How it works
The mechanism, without the hand-waving.
- 01
Androgen receptor signaling
Testosterone acts on receptors throughout the central nervous system and erectile tissue, supporting libido, nocturnal erections and tissue health.
- 02
Nitric oxide synthase support
Adequate androgen levels help maintain the enzymatic machinery that PDE5 inhibitors depend on — which is why some men only respond to a pill once their deficiency is corrected.
- 03
Metabolic effects
Replacement can improve body composition and insulin sensitivity, both of which independently affect vascular health and erectile function.
- 04
Negative feedback
Exogenous testosterone suppresses the body's own production and, with it, sperm production. This is expected, it is dose-related, and it is why fertility planning comes first.
03Candidacy
Who this is for — and who it is not.
Likely a good candidate
- Men with symptoms of hypogonadism confirmed on two separate morning blood draws
- Men with low libido and fatigue alongside their erectile dysfunction, not erectile dysfunction alone
- Men whose response to oral medication has been blunted by a documented deficiency
- Men prepared to commit to indefinite laboratory monitoring
Cautions & contraindications
- Not appropriate for men with untreated prostate or breast cancer
- Not appropriate for men who are actively trying to conceive — alternative protocols exist
- Requires caution and monitoring in men with severe untreated sleep apnea, elevated hematocrit, or significant heart failure
- Never appropriate on the basis of symptoms alone or a single non-morning test result
04 — Our protocol
What actually happens, step by step.
- 01
Full endocrine workup
Two morning total testosterone measurements plus free testosterone, LH, FSH, SHBG, prolactin, estradiol, PSA, hematocrit and a metabolic panel.
- 02
Cause before treatment
We establish whether the problem is testicular or pituitary in origin. Secondary hypogonadism sometimes has a treatable cause that makes replacement unnecessary.
- 03
Fertility discussion
Before any prescription, we discuss family planning and, where relevant, sperm banking or a fertility-sparing alternative.
- 04
Treat, then monitor for life
Reassessment at eight to twelve weeks, then at six months, then at least annually — tracking symptoms, hematocrit, PSA and estradiol, and adjusting as needed.
05Risks & side effects
The part other clinics put in a footnote.
You cannot consent to something you have not been told about. Your physician will go through all of this with you again in person, and answer every question you have about it.
- Rising hematocrit, which thickens the blood and may require dose reduction or phlebotomy
- Suppression of fertility, potentially long-lasting
- Acne, oily skin, and fluid retention
- Worsening of untreated obstructive sleep apnea
- Breast tenderness or enlargement if estradiol conversion is not monitored
My level was 'low normal' and a clinic offered to treat it. Should they?
Probably not on that basis alone. Reference ranges are wide and a single borderline morning value in an asymptomatic man is not a diagnosis. We would repeat the test, add free testosterone and SHBG, and treat the whole picture — not one number.
Will testosterone fix my erections?
If you are truly deficient, it will usually improve desire markedly and may improve erections modestly, often by making other treatments work better. If your testosterone is normal, it will not improve your erections and you will have accepted the risks for nothing.
Is it safe for my heart?
The large TRAVERSE trial published in 2023 found no increase in major adverse cardiac events with testosterone replacement in men with hypogonadism and cardiovascular risk factors. That is reassuring, though it does not remove the need for individual assessment and ongoing monitoring.
Important
The information on this website is provided for general education and does not constitute medical advice, diagnosis, or treatment. Erectile dysfunction can be the first sign of cardiovascular disease, diabetes, or hormonal disorders. Always consult a licensed physician about your individual circumstances, and never start, stop, or change a prescription based on what you read here.
Next step
Find out whether testosterone therapy is right for you.
Candidacy for every treatment on this site is decided by assessment, not by a questionnaire. Start with the consultation and let the findings choose.