What is TRT (testosterone replacement therapy)?
TRT is a long-term medical protocol that restores testosterone to a physiological range in men whose bodies no longer produce enough on their own. It typically uses esterified testosterone delivered by injection, sometimes paired with hCG and an aromatase inhibitor.
Testosterone replacement therapy (TRT) is a long-term medical protocol that restores serum testosterone to a healthy physiological range in men whose bodies no longer produce enough on their own. Unlike performance-enhancement cycles, the goal of TRT is stable, normal hormone levels — not the supraphysiological spikes used by bodybuilders.
How TRT actually works
Most TRT protocols use esterified testosterone — typically cypionate or enanthate — injected intramuscularly or subcutaneously once to three times per week. The ester slows the release of testosterone into the bloodstream, smoothing out the peaks and troughs that come from injecting raw hormone. A typical replacement dose is 100–200 mg per week, calibrated against bloodwork.
Many modern protocols add hCG (human chorionic gonadotropin) two to three times weekly to keep the testes functioning, which helps preserve fertility and intratesticular testosterone. An aromatase inhibitor like anastrozole is sometimes added if estradiol climbs out of range, though most well-dosed men never need one.
Who qualifies?
Clinical guidelines from the Endocrine Society and AUA suggest TRT for men with two morning testosterone readings below the lab reference range (commonly under 264–300 ng/dL) plus clinical symptoms: low libido, fatigue, depressed mood, loss of muscle mass, brain fog, erectile dysfunction, or poor recovery.
What to expect
- Weeks 2–4: improved energy, morning erections, mood lift
- Weeks 4–8: stable libido, better sleep, mental clarity
- Weeks 8–12: body composition shifts — fat loss, lean mass gain
- Months 3–6: strength, recovery, and bone density improvements
TRT is not a cycle
TRT is generally for life. Coming off restores the original deficiency and forces a HPTA restart that may or may not succeed. That permanence is the most important thing to understand before starting.
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Educational content only — not medical advice. TRT Architect helps you model protocols and interpret bloodwork patterns, but prescriptions and clinical decisions belong with a qualified physician.