The prescription foundation of male HRT — how TRT works, what clinical dosing looks like, and how to find a qualified provider who actually runs the right labs.
Testosterone replacement therapy (TRT) restores testosterone levels in men with clinically low production. The two most common injectable esters are testosterone cypionate (Depo-Testosterone) and testosterone enanthate (Delatestryl) — functionally interchangeable, with slightly different release kinetics.
TRT is a prescription medication in the US, classified as a Schedule III controlled substance. It should only be used under the supervision of a licensed provider who has confirmed clinically low testosterone through repeated labs and appropriate symptom evaluation.
FDA approved (Schedule III). Prescription only. WADA prohibited (S1 — Anabolic Agents). StackTrax does not sell or facilitate purchase of TRT.
Exogenous testosterone binds androgen receptors throughout the body — muscle, bone, brain, fat, skin. Drives the anabolic and masculinizing effects.
The cypionate / enanthate ester slows release from the injection depot. Cypionate has a slightly longer half-life (~8 days) vs enanthate (~5 days) — functionally similar at weekly or twice-weekly injections.
Exogenous testosterone signals the hypothalamus to stop producing LH and FSH, which shuts down the testes’ own testosterone and sperm production. This is why TRT usually reduces fertility and testicular size — and why HCG is often added to preserve both.
Some testosterone converts to estradiol via the aromatase enzyme. Too little or too much estradiol both cause problems. Many patients don’t need an AI; those who do use low-dose anastrozole under a provider’s guidance.
TRT has decades of clinical use and is one of the most-studied hormonal therapies. The benefits are consistent when testosterone is actually low and the therapy is done properly.
| Benefit | Evidence |
|---|---|
| Energy & mood | Most reliable; improvements in low-T patients by 4–8 weeks |
| Libido & erectile function | Strong improvements at restored levels; less effective if vascular ED is the root cause |
| Lean mass & strength | Significant gains over 3–12 months at therapeutic levels |
| Bone density | Long-term elevation improves BMD; important in older men |
| Insulin sensitivity | Improvements in metabolic syndrome markers |
| Cognition | Modest improvements in spatial/verbal memory at restored levels |
Build your protocol, log every dose, monitor your body's response, and get reminders so you never miss a dose.
Start Tracking FreeDose is personalized. Your provider titrates based on trough labs, symptoms, and side effects. Note: weekly or twice-weekly dosing is a modern practice to smooth peak-to-trough levels — historically, cypionate / enanthate were dosed every 2–3 weeks (PMID 19011287), though that schedule often leaves levels out of the physiological range >50% of the time. More frequent injections are the reason your provider is likely choosing weekly or twice-weekly.
IM vs. SubQ — actual PK differences: PMID 34694927 showed that 100 mg/week IM testosterone cypionate produced significantly greater rises in estradiol, hematocrit, and PSA compared to SubQ testosterone enanthate autoinjector at the same dose, due to supraphysiological testosterone peaks with IM. Route choice should factor into how closely these labs are monitored, and may influence whether an AI, phlebotomy, or urology workup becomes necessary.
Pre-filled with a typical Testosterone Replacement (Cypionate / Enanthate) setup. Edit any field — the draw updates live.
Insulin syringe — 100 units = 1 mL
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Testosterone Replacement (Cypionate / Enanthate) is a prescription medication. StackTrax does not sell, prescribe, or facilitate purchase of prescription drugs.
Find a clinician who can order baseline lab work, screen for contraindications, monitor your response, and adjust dosing over time. Options to consider:
Before starting, you’ll typically want:
Avoid sources that offer prescription medications without labs, medical history, or licensed-provider oversight. If a telehealth service promises a prescription after a 5-minute questionnaire, that’s a red flag.
Build your protocol, log every dose, monitor your body's response, and get reminders so you never miss a dose.
Start Tracking FreeFor most men who start TRT for genuine clinical hypogonadism, yes. Exogenous testosterone suppresses the hypothalamic-pituitary-gonadal axis, shutting down the testes' own production. Once on TRT, your natural production won't simply resume when you stop unless you actively restart the axis with adjuncts like HCG and SERMs (clomid, enclomiphene). Some men do come off TRT successfully, but it requires a structured restart protocol and there's no guarantee natural production returns to pre-treatment levels.
Cardiovascular risk has been debated in the literature, but recent data is largely reassuring at therapeutic doses. The key qualifier is therapeutic doses — pushing total testosterone supraphysiologically high or letting hematocrit climb above 54% does add cardiovascular risk. Active uncontrolled heart failure is a contraindication. Standard monitoring catches the relevant signals (hematocrit, lipids, blood pressure) long before they become dangerous.
No. TRT restores testosterone to the physiological range (target ~600-900 ng/dL trough) in men with clinically low production, using doses around 100-200 mg/week. Anabolic steroid abuse typically uses supraphysiological doses (often 500-1000+ mg/week, stacked with other compounds) aimed at performance enhancement, not replacement. The mechanism is the same hormone, but the dose and intent differ substantially. TRT is FDA-approved as a Schedule III prescription medication used under provider supervision.
TRT does not cause prostate cancer based on current evidence, but active prostate cancer is an absolute contraindication because testosterone can fuel existing disease. Family history of prostate cancer is a use-caution flag, not a hard no. TRT does cause benign prostate volume increase, and BPH with significant urinary symptoms is another use-caution scenario. Standard monitoring includes baseline and ongoing PSA.
Stopping TRT without a restart protocol typically leaves men with hypogonadal levels for an extended period because the HPG axis stays suppressed. A structured restart usually combines HCG (to wake up the Leydig cells) with a SERM like clomid or enclomiphene (to restart endogenous LH/FSH production). This is provider-directed territory. Some men recover full endogenous production; others find their natural levels never return to pre-TRT baselines.
Yes. Exogenous testosterone signals the hypothalamus to stop producing LH and FSH, which shuts down the testes' own testosterone and sperm production. This is why TRT usually reduces fertility and testicular size. HCG (500-1500 IU 2-3x/week) is commonly added to TRT protocols specifically to preserve testicular size and fertility by directly stimulating the Leydig cells, bypassing the suppressed axis.
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