Testosterone Enanthate
Test E · TE · Test Enth
Long-acting testosterone ester; the most common TRT and cycle base. Reaches steady state in ~5 weeks.
Key takeaways
- The most common TRT and cycle-base ester — ~7-day half-life, steady state in about 5 weeks.
- Twice-weekly injection smooths peaks and troughs and reduces estradiol/hematocrit excursions vs once-weekly.
- Aromatizes to estradiol; monitor E2, hematocrit, PSA, and lipids throughout use.
- Full HPTA suppression is rapid — any non-TRT cycle needs a structured PCT planned in advance.
Overview
What it is
Testosterone enanthate is a long-acting injectable testosterone ester and the most common base compound in both clinical TRT and non-medical cycles. Tissue esterases cleave the ester after injection, releasing free testosterone that binds the androgen receptor and drives protein synthesis, nitrogen retention, and erythropoiesis.
Pharmacokinetics
Its 7.19-day half-life gives a serum peak around 1.4 days post-injection and roughly 5 weeks to steady state, which is why twice-weekly injection is the common schedule — it smooths the peak-to-trough swing.
Harm reduction
It aromatizes readily to estradiol and 5-alpha-reduces to DHT, so the core monitoring set is estradiol, hematocrit, PSA, and lipids. HPTA suppression is complete and rapid, so any non-TRT use needs a structured PCT. It is not hepatotoxic since it bypasses first-pass metabolism.
Reported dosing protocols
Protocols reported in research literature and clinic/community use — informational context, not a dosing recommendation.
| Use case | Dose | Route | Frequency | Duration |
|---|---|---|---|---|
| TRT (clinical) | 75–100 mg weekly (or 150–200 mg q2wk) | IM | 1–2× weekly | Ongoing |
| Performance (community) | 300–600 mg weekly | IM | 2× weekly | 10–16 weeks |
Pharmacokinetic summary
- Model tier
- Linear Regression (sublinear dose)
- Half-life
- 7.2 days
- Cmax
- 1122 ng/dL
- Tmax
- 1.4 days
- Bioavailability
- 72%
- Typical dose
- 100–600 mg
Harm reduction
- Aromatizes
- Yes
- DHT derivative
- No
- Injection frequency
- 2×/week
- Bloodwork range
- 300–1000 ng/dL
Frequently asked questions
Enanthate vs cypionate — what's the difference?
Almost nothing practical. Cypionate carries one extra ester carbon and a marginally longer tail (~8 vs ~7 days half-life). Schedules and blood levels are effectively interchangeable; enanthate dominates outside the US, cypionate within it.
How long until testosterone enanthate reaches steady levels?
About 5 weeks at a stable schedule, roughly five half-lives. Levels peak around 1.4 days after each injection and decline over the following week, which is why the weekly dose is usually split rather than given all at once.
Do you need PCT after a testosterone enanthate cycle?
Yes for any non-TRT use. Exogenous testosterone fully suppresses the HPTA within weeks. PCT (typically SERMs) starts only after the ester clears — with a ~7-day half-life, that means waiting roughly 2–3 weeks after the last injection.
References
- JCEM / Physiological Reviews — Advanced + Linear Regression model. Cmax is sublinear in dose.
- Behre & Nieschlag, testosterone ester PK review (PMC) — Source of the half-life and Cmax values in this entry.
- Snyder et al., NEJM 2016 — The Testosterone Trials — Largest RCT set on testosterone replacement in older men with low T.
Related articles
Related compounds
Testosterone Cypionate
Standard US TRT ester with a slightly longer release tail than enanthate. Steady state ~4–5 weeks.
Testosterone Propionate
Short-acting ester with sharp peaks; requires frequent injection. Useful for frontloading.
Testosterone Undecanoate (Castor Oil)
Very long-acting ester (Nebido). Dosed 1000 mg every 10–14 weeks for TRT. NHS standard.
Protocols featuring Testosterone Enanthate
Beginner Testosterone Enanthate (12 weeks)
The canonical first cycle: 500 mg Test E per week (250 mg 2×/week) for 12 weeks. The most-cited textbook beginner cycle.
Test E + Deca with NPP Frontload (20 weeks)
Long cycle using NPP for a fast kickstart while Deca reaches steady state.
Test E + Dianabol Bulking Kickstart (12 weeks)
Classic bulking base of Test E with 4 weeks of Dianabol to front-load mass.
Comments
Loading comments…