Anabolic steroidAndrogenInjectable19-nortestosteroneTrenbolone esterLong-ester

Trenbolone Hexahydrobenzylcarbonate (Parabolan, Veterinary)

Also known as Parabolan · Tren hex · Hexabolan

Written by enwyReviewed 15 Jul 20261 sources0 comments

Trenbolone hexahydrobenzylcarbonate is the long-ester veterinary/human-grey form of trenbolone (Parabolan, originally Finajet/Hexabolan lineage), releasing the same potent 19-nor trienolone androgen slowly over weeks. It is among the most sought-after diverted trenbolone esters, with a powerful anabolic effect and a harsh side-effect profile.

01 Overview

This ester attaches a hexahydrobenzylcarbonate group to trenbolone, giving a slow, sustained release comparable to enanthate. It reached notoriety as Parabolan, one of the few trenbolone products intended for injection rather than as a cattle implant, before being widely counterfeited.

Diverted to bodybuilding it delivers the full trenbolone experience: exceptional lean-mass and strength gains combined with strong progestogenic and androgenic side effects, night sweats, insomnia and severe HPTA suppression, with no aromatisation. This entry covers the long-ester veterinary/grey form distinct from the acetate implant.

02 Mechanism

Trenbolone is a very high-affinity androgen-receptor agonist with progesterone-receptor activity; it does not aromatise and resists 5-alpha reduction. The hexahydrobenzylcarbonate ester provides slow, prolonged release.

03 Dosing

Tier	Dose	Route	Notes
Diverted human use (anecdotal)	150–300 mg/wk	IM	Illicit human dosing; no legitimate human indication

Ester comparison

Ester	Half-life	Injection freq.	Testosterone by mass

04 Effects

Effect	Magnitude	Evidence
Potent lean mass and strength gainDelivers strong, dry gains and strength increases without water retention.		Observational
Nutrient partitioningReputed to improve body composition strongly, consistent with its cattle growth-promotant lineage.		Anecdotal

05 Side effects

Effect	Severity	Frequency	Evidence	Countermeasures
Night sweats and insomniaTrenbolone is characteristically associated with sweating, insomnia and elevated resting heart rate.	Moderate	Common	Anecdotal
Progestogenic side effectsProgesterone-receptor activity can drive gynecomastia, libido loss and mood disturbance.	Severe	Common	Observational

06 Legal status

Prohibited hormonal agent

Trenbolone growth-promotant use banned in food animals · as of Jan 2026

United States

Schedule III anabolic steroid

No legitimate human product; controlled-substance status · as of Jan 2026

07 References

Trenbolone esters in doping controlDrug Testing and Analysis

08 Discussion0 comments

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This page is reference information, not medical advice. Doses and protocols are documented as they appear in the clinical literature and in practice — describing them is not a recommendation to use them. Countermeasures listed here are not a substitute for a physician. Legal status varies by jurisdiction and changes.