# Trenbolone Hexahydrobenzylcarbonate

*Also known as: Tren Hex, Parabolan*

Long-acting trenbolone (original Parabolan). Simple model — peak calibrated.

## Overview

Trenbolone hexahydrobenzylcarbonate (Tren Hex, original brand Parabolan) is a long-acting injectable ester of trenbolone, a 19-nor anabolic derived from nandrolone but far more potent. The hexahydrobenzylcarbonate ester slows release from the depot over roughly a week. Trenbolone binds the androgen receptor with about three times testosterone's affinity and resists both 5-alpha-reduction and aromatization, so it does not convert to estrogen or DHT. The dataset lists a half-life of 8 days (192 hours), Cmax near 114 ng/dL, and bioavailability around 66%. Documented research and athletic protocols inject it twice weekly. Two harm-reduction points stand out: trenbolone is mildly hepatotoxic and notoriously harsh on cardiovascular and mental-health markers.

## Pharmacokinetics

- **Model tier:** simple
- **Half-life:** 8.0 days (192 hours)
- **Cmax:** 113.5 ng/dL
- **Bioavailability:** 66%

## Dosing

- **Default dose:** 150 mg
- **Typical range:** 100–300 mg
- **Units:** ng/dL

## Harm reduction

- **Aromatizes:** No
- **DHT derivative:** No
- **Hepatotoxicity:** mild
- **Injection frequency:** 2×/week
- **Interaction notes:** Trenbolone + PDE5 inhibitors (e.g. tadalafil) raises cardiovascular risk.

## Detection time (anti-doping)

- **Window:** 30–60 days post-last-dose
- **Target metabolite:** Epitrenbolone (17α-trenbolone) glucuronide
- **Assay:** LC-MS/MS
- **Notes:** Long-ester depot similar to enanthate; epitrenbolone glucuronide detection ceiling ~1–2 months.

## Source

- **Label:** Trenbolone ester PK
- **URL:** https://www.sciencedirect.com/science/article/abs/pii/S002228602030452X
- **Notes:** Cmax calibrated to ng/dL serum peak.

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