Hormone optimization for clinically diagnosed hypogonadism. Full protocol: bloodwork, endocrinologist evaluation, ongoing monitoring. Not a shortcut — a medically supervised restoration.
TRT (testosterone replacement therapy) treats diagnosed hypogonadism via Enanthate, Undecanoate, gel, or hCG protocols. Target testosterone 450–800 ng/dL. Requires baseline bloodwork, endocrinology evaluation, and ongoing monitoring (testosterone, hematocrit, PSA, lipids every 6–12 weeks initially). Most effective formulations at arq.: Enanthate (50–100 mg/week IM), Undecanoate (1000 mg IM every 12 weeks). All require continued doctor oversight.
| Formulation | Dose/Frequency | Pros | Monitoring Needs |
|---|---|---|---|
| Enanthate | 50–100 mg/week IM | Stable levels, cost-effective, fast acting, flexible dosing | Every 6–8 weeks: T, E2, hematocrit, lipids |
| Undecanoate | 1000 mg IM every 12 weeks | Lowest injection frequency, steady-state by week 8, good tolerability | Every 12 weeks: T, E2, hematocrit, PSA, lipids |
| Gel (transdermal) | 25–100 mg/day topical | Non-invasive, no injections, easy titration | Every 4–6 weeks: T, E2; risk skin irritation, suboptimal absorption |
| hCG (co-therapy) | 250–500 IU 2–3x/week SC | Preserves testicular volume & fertility, synergizes with T | Every 8–12 weeks: FSH, LH; testicular ultrasound annually |
| Target Testosterone | 450–800 ng/dL (physiologic range); adjust dose to achieve trough in this window | ||
Testosterone replacement therapy addresses hypogonadism by restoring physiological testosterone levels through exogenous supplementation. Unlike performance-enhancement approaches, clinical TRT is dosed to achieve target ranges (450–800 ng/dL) under strict medical supervision.
Testosterone pharmacokinetics vary dramatically by formulation. Injections produce sustained depot effects, gels absorb transdermally, and oral forms undergo first-pass hepatic metabolism. Protein binding is >98%, ensuring prolonged action and physiological regulation through SHBG.
| Bioavailability (oral, undecanoate) | 3–7% (significantly enhanced with fatty meal) |
| Tmax (oral undecanoate) | 4–5 hours |
| Tmax (intramuscular cypionate) | 7 days (peak at 72 hrs) |
| Half-life (cypionate injection) | 8 days |
| Half-life (transdermal gel) | 24–48 hours |
| Protein binding | ~98% (SHBG ~66%, albumin ~32%) |
| Metabolism | CYP3A4 → DHT and estradiol (aromatization). Significant first-pass (oral). |
| Excretion | Renal (as metabolites 90%), fecal 10% |
Testosterone dosing depends on formulation, individual response, and target level. Your endocrinologist will customize dosing based on baseline labs, symptoms, and tolerance. Standard arq protocols follow evidence-based guidelines.
Testosterone replacement in hypogonadal men is well-supported by large RCTs demonstrating improvements in sexual function, mood, body composition, and bone density. Long-term safety remains an area of ongoing research and monitoring.
At physiological doses with proper monitoring, TRT is generally well-tolerated. Side effects are usually manageable with dosing adjustments or ancillary medications. Regular bloodwork is essential to detect and prevent serious complications.
Testosterone can potentiate or modify the effects of several drug classes. Most interactions are manageable with dosing adjustments. Your endocrinologist will review your full medication list.
Book a consultation with an endocrinologist to discuss whether TRT is appropriate for you. The first step is bloodwork and diagnosis.