What is testosterone replacement therapy (TRT)?
TRT is the direct supplementation of exogenous testosterone, typically as testosterone cypionate (200 mg/mL), for men with biochemically confirmed low testosterone. The goal is to restore total T to optimal range (typically 700-1000 ng/dL) and resolve symptoms: low energy, low libido, brain fog, sleep dysfunction, mood flatness, declining strength.
Standard protocols use 80-200 mg per week, split into 1-2 weekly subcutaneous or intramuscular injections. Dose is calibrated to total T, free T, SHBG, estradiol, and hematocrit labs, typically retested at week 6-8 and quarterly thereafter.
Enclomiphene vs TRT: which is right for you?
The decision hinges on fertility and how your hormones got low in the first place.
TRT works for everyone, directly replaces the hormone, but suppresses the natural axis: LH and FSH drop, testes shrink, sperm production decreases, often dramatically within 3-6 months. For men done with childbearing or who don't care about fertility, this is irrelevant.
Enclomiphene works only for secondary hypogonadism (the pituitary is the bottleneck, not the testes). It blocks estrogen feedback at the hypothalamus, which signals the pituitary to release more LH and FSH, which signals the testes to produce more testosterone naturally. Fertility, testicular size, and endogenous production are preserved.
If your LH/FSH are normal-to-low and total T is sub-optimal, enclomiphene is the cleaner first step. If LH/FSH are elevated (testicular failure), enclomiphene won't work, TRT is the only option.
The labs that actually matter
A meaningful baseline panel includes: Total testosterone, Free testosterone (Vermeulen calculation from total T + SHBG + albumin), SHBG, Estradiol (sensitive assay), LH, FSH, hematocrit, lipids, PSA (men over 40), and a comprehensive metabolic panel.
Total T alone tells you a fraction of the story. Free T is the bioavailable hormone after SHBG binding, often the more clinically relevant number when SHBG is elevated. Estradiol matters because aromatase converts ~5% of testosterone to estradiol, and estradiol affects libido, mood, and bone density. LH/FSH tell you whether your testes or your pituitary is the bottleneck.
Side effects, safety, and what to monitor
TRT side effects: elevated hematocrit (most common, managed by donating blood or dose reduction), aromatization to estradiol (managed by anastrozole if needed), acne, water retention. Long-term cardiovascular safety was reaffirmed by the TRAVERSE trial (NEJM 2023), no increased cardiovascular risk with proper monitoring.
Enclomiphene side effects: mild, occasional vision changes, mood shifts, mild GI. Long-term safety data is more limited than TRT but the mechanism (enhanced endogenous production rather than exogenous replacement) is generally considered safer for most men.
Both protocols require lab monitoring at week 6-8, week 12, and quarterly thereafter. OPTML annual plans include this monitoring; provider sign-off is required before any dose change.
How to start: the OPTML pathway
1. Take the Find My Protocol quiz or the testosterone calculator to benchmark your current state and ADAM-screen your symptoms.
2. Start a 5-minute intake. A licensed OPTML physician orders a comprehensive baseline lab panel (drawn at any Quest or Labcorp).
3. The provider reviews your results and prescribes the right protocol, TRT, enclomiphene, or hold (if labs are optimal and symptoms have another root cause).
4. Medication ships in 2-3 days. Follow-up labs at week 6-8, then quarterly.
Primary sources cited
- Vermeulen A et al. JCEM 1999;84:3666-3672 (Free T calculation)
- Bhasin S et al. JCEM 2018;103:1715-1744 (Endocrine Society Guidelines)
- Kaminetsky J et al. J Sex Med 2013;10:1628-1635 (Enclomiphene)