# Testosterone Decanoate

*Also known as: Test Deca*

Long-chain ester (Sustanon component). Simple model.

## Overview

Testosterone decanoate is a long-chain testosterone ester, encountered as the longest-acting component of blended preparations like Sustanon and as a standalone injectable in some markets. Tissue esterases cleave the decanoate ester slowly to release free testosterone, producing sustained release over roughly two weeks per injection. The compound has a roughly 134-hour half-life, about 65% bioavailability, and supports once or twice weekly dosing to maintain stable serum levels given the long depot tail. Effects are those of testosterone, covering replacement androgen activity or anabolic effects at higher doses, while the ester aromatizes fully to estradiol and the long tail means serum levels change slowly in response to any dose adjustment. Harm reduction centers on understanding that the long half-life delays steady state and washout by several weeks and on the patience required when titrating dose up or down.

## Pharmacokinetics

- **Model tier:** simple
- **Half-life:** 5.6 days (134.39999999999998 hours)
- **Cmax:** 92.2 ng/dL
- **Bioavailability:** 65%

## Dosing

- **Default dose:** 100 mg
- **Typical range:** 100–300 mg
- **Units:** ng/dL

## Harm reduction

- **Aromatizes:** Yes
- **DHT derivative:** No
- **Injection frequency:** 1–2×/week

## Source

- **Label:** Sobraf serum T detection
- **URL:** https://sobraf.org/
- **Notes:** Cmax calibrated to ng/dL serum peak.

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**Canonical URL:** https://anabolicdex.com/compounds/testosterone-decanoate
**Plot:** https://anabolicdex.com/plot?compound=testosterone-decanoate