Testosterone Enanthate
Test E · TE · Test Enth
Long-acting testosterone ester; the most common TRT and cycle base. Reaches steady state in ~5 weeks.
Overview
Testosterone enanthate is a long-acting synthetic testosterone ester and the most common base compound in both clinical TRT and non-medical cycles. Once injected, tissue esterases cleave the ester and release free testosterone, which binds the androgen receptor and drives the classic androgenic-anabolic effects: protein synthesis, nitrogen retention, erythropoiesis, and HPTA feedback. Its 7.19-day half-life gives a peak around 1.4 days post-injection with roughly 5 weeks to steady state, which is why research protocols have used twice-weekly injection to smooth the peak-to-trough swing. It aromatizes readily to estradiol and 5-alpha-reduces to DHT, so the real harm-reduction work is monitoring E2, hematocrit, PSA, and lipids. HPTA suppression is complete and rapid, and recovery requires a structured PCT. It is not hepatotoxic.
Pharmacokinetic summary
- Model tier
- Linear Regression (sublinear dose)
- Half-life
- 7 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
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.
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