Testosterone Decanoate
Test Deca
Long-chain ester (Sustanon component). Simple model.
Key takeaways
- Long ester; the 100 mg tail component of Sustanon 250.
- ~5.6-day half-life (estimate from blend data); 1–2× weekly when used alone.
- Slow to reach steady state; washout and PCT timing run weeks later than short esters.
- Full testosterone monitoring applies: estradiol, hematocrit, lipids, PSA.
Reported dosing protocols
Protocols reported in research literature and clinic/community use — informational context, not a dosing recommendation.
| Use case | Dose | Route | Frequency | Duration |
|---|---|---|---|---|
| Blend component (label) | 100 mg per mL of Sustanon 250 | IM | Blend every 2–3 weeks (label); community splits 1–2× weekly | |
| Standalone (community) | 100–300 mg | IM | 1–2× weekly | 10–12 weeks |
Pharmacokinetic summary
- Model tier
- Simple (t½ + F, Tmax estimated)
- Half-life
- 5.6 days
- Cmax
- 92.2 ng/dL
- Bioavailability
- 65%
- Typical dose
- 100–300 mg
Harm reduction
- Aromatizes
- Yes
- DHT derivative
- No
- Injection frequency
- 1–2×/week
Frequently asked questions
Can you buy decanoate on its own?
Not as a pharmaceutical. It exists commercially only inside Sustanon-style blends; standalone vials come from underground labs with the usual concentration and sterility uncertainty. The plotter curve is correspondingly an estimate.
Decanoate vs undecanoate — which lasts longer?
Undecanoate, clearly. Its ~20–34-day half-life (carrier-dependent) dwarfs decanoate's ~5.6 days. That's why undecanoate products are dosed every 10–14 weeks while decanoate-containing blends still need weekly splitting for stable levels.
When does PCT start after Sustanon?
Later than people assume. The decanoate tail keeps releasing for weeks after the last shot, so starting SERMs at the two-week mark (a short-ester rule of thumb) lands while levels are still suppressive. Three weeks or more is the commonly used wait.
References
- Sobraf serum T detection — Cmax calibrated to ng/dL serum peak.
- Pharmacology of testosterone replacement therapy preparations (TAU 2016) — Review of ester pharmacology including Sustanon composition.
Related compounds
Testosterone Enanthate
Long-acting testosterone ester; the most common TRT and cycle base. Reaches steady state in ~5 weeks.
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.
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