Most TRT protocols start wrong.
You get bloodwork showing low testosterone. You get prescribed 100mg per week. You feel incrementally better for three weeks. Then nothing changes. Your doctor assumes you are non-responder. You assume TRT doesn’t work.
The issue: 100mg per week is a starting dose designed for monitoring, not for clinical effect. The protocol is incomplete.
Here is how to actually start TRT — and what the first 90 days actually look like when it is done correctly.
Last Updated: March 2026 | Coach Angelo
What Is TRT (Testosterone Replacement Therapy)?
TRT is long-term testosterone replacement for men with documented low testosterone (hypogonadism) due to age, injury, disease, or other medical conditions. It is legally prescribed by physicians and is not the same as a steroid cycle.
TRT is intended to restore testosterone to the normal range (300–1000ng/dL) and maintain it there indefinitely. Unlike a cycle, which is temporary, TRT is a commitment — you start it, you continue it for life (or until your situation changes).
This article describes TRT from a coaching perspective, including optimization beyond basic medical dosing. If you are considering TRT, work with a physician. This is not medical advice — it is a framework for understanding how TRT functions and how to manage it properly.
Hypogonadism: Types and Causes
Primary hypogonadism (testicular): The testes cannot produce testosterone adequately. Causes: age, injury, genetic condition, cancer treatment, or unknown (idiopathic). LH is high (pituitary is trying to signal, but testes are not responding). FSH is high. Testosterone is low. TRT restores testosterone. Fertility is difficult to recover.
Secondary hypogonadism (pituitary/hypothalamic): The brain is not signaling the testes adequately. Causes: pituitary tumors, extreme calorie restriction, chronic disease, or unknown. LH is low or normal. FSH is low. Testosterone is low. TRT restores testosterone. In some cases, fertility may be recoverable with GnRH therapy or HCG.
Age-related hypogonadism: Testosterone naturally declines with age (~1% per year after 30). At some point, it drops into the hypogonadism range (<300ng/dL) despite otherwise normal health. TRT is controversial in pure age-related hypogonadism — some physicians will treat, others will not, depending on symptoms.
Proper diagnosis requires bloodwork: total testosterone, free testosterone, LH, FSH, prolactin, and sometimes DHEA-S and estradiol. A single low testosterone reading is not enough — repeat it on a different day (morning, fasting) to confirm. Many men have one low reading due to stress or poor sleep, then retest normally.
How Testosterone Replacement Works: Mechanism
Exogenous testosterone restores serum levels: Injections, gels, patches, or pellets increase circulating testosterone. The dose is titrated until serum testosterone reaches 500–700ng/dL (target range for most TRT).
Negative feedback remains intact: Unlike a steroid cycle where exogenous testosterone shuts down the pituitary completely, TRT dosing is intentionally modest. LH and FSH remain partially suppressed, but not to zero. This is a compromise: testosterone is restored, but fertility is often affected (sperm production decreases on TRT).
Aromatization to estradiol: Even on TRT, some testosterone aromatizes to estradiol. At normal TRT dosing (100–200mg/week), estradiol typically rises to 25–45pg/mL. This is slightly elevated but often well-tolerated. Some men develop sensitivity and need AI (aromatase inhibitor) support. Most do not.
DHT conversion:**Testosterone is converted to DHT (dihydrotestosterone) via 5-alpha reductase. At TRT doses, DHT levels usually normalize. Some men are sensitive and experience hair loss or aggression — these can be managed with 5-alpha reductase inhibitor (like finasteride) or dose adjustment.
Benefits of Proper TRT
Restored Energy and Motivation
Low testosterone causes fatigue and lack of motivation. TRT restores energy — not to superhuman levels, but to a baseline where training and work are sustainable. The effect appears within 2–4 weeks as testosterone rises.
Improved Strength and Muscle Mass
TRT at proper dose (not 100mg starting dose, but the maintenance dose after titration) produces modest muscle gain and strength increase. Expected: 2–5kg of lean tissue gain in the first 6–12 months, then stabilization. This is slower than a steroid cycle but permanent as long as TRT continues.
Enhanced Mood and Cognitive Function
Testosterone directly affects neurotransmitters: dopamine, serotonin, GABA. Adequate testosterone improves mood, focus, and memory. Many men on low testosterone report depression or brain fog that resolves within weeks of starting TRT.
Improved Sexual Function
Low testosterone causes ED, low libido, and poor orgasm quality. TRT restores sexual function within 4–8 weeks as testosterone rises. This is often the most noticeable benefit to the user.
TRT Protocol: First 90 Days (Real Timeline)
Week 0 (baseline): Bloodwork — total testosterone, free testosterone, LH, FSH, prolactin, lipids, liver enzymes, hematocrit, blood pressure. Establish baseline. If testosterone is truly low (multiple measurements <300ng/dL) and symptoms align (fatigue, mood, ED), TRT is indicated.
Week 1–2 (start TRT): Typical starter protocol: testosterone enanthate or cypionate, 100mg per week (one injection). Some physicians start 50mg to be conservative. Most start 100mg.
Why 100mg? At 100mg/week, serum testosterone rises to approximately 400–600ng/dL (depending on metabolism and individual variation). This is in the low-normal range. It is intentionally not high — the goal is cautious titration, not rapid saturation.
Week 3–4 (assessment): Patient reports initial response: slight energy increase, slight mood lift, possibly slight ED improvement. Bloodwork at week 4–6 is optional but informative (check testosterone level, ensure it is responding as expected).
Week 5–8 (titration decision): If response is incomplete (still fatigue, still ED, still low mood), dose is often increased to 125–150mg per week. If response is good but not excellent, maintain 100mg and allow more time (testosterone continues rising until week 6–8 due to ester saturation). If sides develop (high E2 symptoms: water retention, gynecomastia), dose may be reduced or AI added.
Week 8–12 (stabilization): Dose is finalized. Most men find their optimal dose is 100–200mg per week. Anything below 100mg produces minimal effect. Anything above 200mg pushes into “performance enhancement” territory and carries more side effects. Typical maintenance: 150mg per week.
Week 12 (bloodwork): Repeat total testosterone, free testosterone, lipids, hematocrit, liver enzymes, estradiol (if high E2 symptoms develop). Testosterone should be 500–900ng/dL. If below 400ng/dL, dose increase is needed. If above 1000ng/dL, dose reduction is recommended (risk of side effects increases significantly).
TRT Administration: Injection Protocols
Once weekly (standard): 100–200mg of testosterone enanthate or cypionate, injected once per week (e.g., every Monday). Blood levels fluctuate (high early week, lower late week, but remain in therapeutic range). Most men tolerate this well.
Twice weekly (alternative): 75–100mg twice weekly. Produces more stable blood levels throughout the week (less peak-and-trough effect). Some men feel better on twice-weekly dosing, though logistically it is less convenient than once weekly.
Gel or cream (alternative): Daily topical application. Dosing flexibility is high. Good for men who prefer to avoid needles. Less stable levels. Requires daily compliance.
Patch (alternative): Daily or twice-daily application. Similar benefit/drawback profile to gels.
Pellets (alternative, less common): Surgically implanted pellets release testosterone over 3–6 months. No needle phobia required, but surgical placement is required. Removal is difficult if sides develop.
For coaching purposes, injections (enanthate/cypionate) are standard. Gels and patches are less predictable. Pellets are less flexible. Choose injectable if possible.
Estrogen and AI Management on TRT
Do I need an aromatase inhibitor on TRT? Not always. At 100–150mg testosterone per week, estradiol typically rises to 25–45pg/mL. This is slightly elevated from the normal range (15–35pg/mL) but often asymptomatic. Most men tolerate it without AI.
When is AI needed? If symptoms develop: excessive water retention (3–5kg gain despite consistent diet), gynecomastia risk (breast tissue sensitivity), or mood disturbance (depression, irritability). Symptoms suggest E2 is too high.
Dosing if needed: Start low. 0.25mg anastrozole twice per week or every third day. Check E2 bloodwork in 3–4 weeks. Target: E2 20–40pg/mL. If E2 is crashed below 15pg/mL, reduce AI dose (joint pain, low libido, mood crash are signs of crashed E2).
Important: Do not assume you need AI. Do not start with AI. Run TRT without AI first. If sides develop, add AI. Most men do not need it.
Side Effects and Management
Acne and oily skin: Dose-dependent. Usually mild on TRT doses. Managed with skin hygiene and topical treatments. If severe, usually resolves with dose reduction.
Water retention: Usually mild (1–3kg). Sign that E2 is slightly elevated. Managed with sodium moderation and optional AI. Should not exceed 3–5kg at therapeutic doses.
Blood pressure increase: Testosterone increases BP slightly (typically 5–10mmHg). Check BP monthly. If systolic exceeds 150mmHg, inform your physician — dose reduction or anti-hypertensive medication may be needed.
Lipid changes: LDL typically increases slightly, HDL decreases slightly. Magnitude is dose-dependent. At 100–150mg/week, changes are modest. Check lipids every 6 months. If lipids degrade significantly (LDL >160, HDL <30), discuss with physician.
Hematocrit increase: Testosterone stimulates red blood cell production. Hematocrit typically rises 3–5% above baseline. This is normal. If hematocrit exceeds 54%, donate blood or discuss dose reduction with physician. High hematocrit increases clotting risk.
Mood changes (typically positive, but can be problematic): Most men feel better on TRT. Some become more aggressive or irritable at higher doses. Dose-dependent. If mood disturbance develops, reduce dose or discuss with physician.
Testicular atrophy: Testes shrink slightly on TRT due to LH suppression. Decrease is usually 10–20% of volume. Reversible if TRT is discontinued, though recovery is slow (months). On long-term TRT, atrophy persists.
Fertility on TRT
Short answer: TRT suppresses fertility. Sperm production decreases due to LH suppression. Most men on TRT become infertile within 3–6 months.
If fertility is important: Before starting TRT, discuss fertility preservation (sperm banking) with your physician. Some physicians will add HCG (human chorionic gonadotropin) during TRT to maintain some level of sperm production, though this is not standard and may not fully preserve fertility.
Alternative: If you want to father children while hypogonadal, discuss with physician whether HCG therapy alone (without testosterone) might work, or whether fertility preservation now and TRT later is appropriate.
Long-Term TRT: What to Expect
Months 1–3: Rapid symptom improvement (energy, mood, sexual function). Body begins to change (muscle gain, fat loss potential). Energy and motivation stable.
Months 3–12: Continued slow muscle gain (2–5kg total). Fat loss possible if diet and training support it. Libido remains strong. Mood stable. Strength improved.
Year 1+: Muscle gain plateaus at natural ceiling for your training. Strength stable. Sexual function maintained. The benefit is stability and maintenance, not continued rapid gains. This is normal — you are at your physiologic ceiling, and TRT is maintaining you there.
Important caveat: If you are training like an athlete and eating like an athlete, you will gain more muscle and strength than above. But the ceiling is still determined by natural anabolic potential + the modest anabolic effect of physiologic testosterone.
Where Most Men Get TRT Wrong
Abandoning TRT at 100mg because results are “weak.” 100mg is a starting dose, not an optimized dose. Many physicians keep it low for safety monitoring. Wait for titration. Weeks 1–4 at 100mg feels incomplete because it IS incomplete — testosterone is not yet at steady state. Weeks 8–12 show the real effect.
Expecting steroid-cycle results from TRT. TRT produces modest improvements, not dramatic transformation. If you want to look like a bodybuilder, TRT alone will not do it. TRT maintains a healthy, strong physique if training and nutrition support it.
Not doing bloodwork to guide dosing. TRT without bloodwork is guesswork. You do not know if your dose is too low (ineffective) or too high (sides). Bloodwork at week 6 and week 12 guides titration.
Skipping AI and developing E2 sides. “Testosterone is natural, I don’t need an AI.” But on TRT, E2 can elevate. If gynecomastia or excessive water retention develops, you need AI. Do not ignore symptoms.
Adding compounds to TRT. “I’m on TRT, I should add something for better results.” TRT is enough for health and maintenance. If you want to enhance beyond that, discuss with your physician. Adding compounds to TRT without medical guidance is risky — you lose monitoring and enter performance enhancement territory.
Coach Angelo’s Assessment
TRT is not sexy. It is not a transformation. It is not “biohacking.” It is medical treatment for low testosterone.
But if you have genuinely low testosterone (confirmed by bloodwork), TRT is life-changing. Energy returns. Mood improves. Sexual function normalizes. You regain baseline capacity for training and living.
The key is patience through the first 90 days. 100mg feels incomplete. Weeks 8–12 show the real effect. Titrate based on symptoms and bloodwork. Find your dose (usually 150mg/week). Stay on it. Recheck bloodwork annually.
TRT is not a cycle. It is a commitment. But if you have low testosterone, it is worth it.
Frequently Asked Questions
How do I know if I have low testosterone?
Symptoms alone are not diagnostic. Get bloodwork: total testosterone (ideally fasting, morning), free testosterone. If total is consistently below 300ng/dL on multiple tests, low testosterone is likely. Repeat testing on different days confirms. One low reading due to stress or poor sleep is not enough.
Is 100mg per week the right dose?
100mg is a common starting dose, but it is conservative. Many men need 150–200mg to feel optimal. Start at 100mg, assess at week 6, increase if needed. Your optimal dose is the lowest dose that produces symptom resolution and acceptable bloodwork.
Do I need to do bloodwork while on TRT?
Yes. Minimum: at baseline (before starting), week 6–8 (initial titration), and every 6–12 months long-term (to ensure dose is still optimal and sides are not developing). More frequent bloodwork early allows faster titration.
Will TRT make me aggressive?
Not typically at therapeutic doses (100–200mg/week). At these doses, aggression is usually minimal or absent. Some men report slight mood improvement, some report slight irritability. Dose-dependent. If aggression develops, reduce dose or discuss with physician.
Can I stop TRT and restart later?
Yes. If you discontinue TRT, testosterone will drop back to your baseline (low) within weeks. You can restart later. However, stopping and restarting is disruptive — you lose the benefits, then regain them slowly. Most men on TRT stay on it long-term because the benefit-to-hassle ratio is high.
Will TRT cause infertility?
TRT suppresses sperm production due to LH suppression. Most men become infertile within 3–6 months of starting TRT. If fertility is important, discuss with physician before starting. Sperm banking or alternative protocols may be options.
Coach Angelo is an online physique coach based in Europe, specialising in peptide protocols, steroid cycle design and evidence-based enhancement. He has coached 80+ client transformations. Work with Angelo →