This information is for research and educational purposes only. No medical recommendations. Products are not approved for human use. For health questions, consult a doctor.

Lexicon

Muscle & performance

Tren Hex (Parabolan)

The longest tren ester - the same potent trenbolone, just the most convenient to dose.

1 min read 2 sources Titration Updated June 2026
Class
19-nor anabolic (long hexahydrobenzylcarbonate ester)
Use
Intramuscular (subQ possible), 2x per week
Half-life
about 7-10 days
WADA
banned (anabolic)

Getting started

Typical dosing (research context)

Per-week figures in mg, split across 2 injections. Longest tren ester (Parabolan). Very strong.

Members only

Dosing recommendations are visible to logged-in members only. Logging in is free.

Log in / sign up

What is Tren Hex?

Tren Hex (Trenbolone Hexahydrobenzylcarbonate, historically known as Parabolan) is the same trenbolone molecule as tren acetate and enanthate, just with the longest ester. That means the least frequent injections and very stable blood levels - at identical effect and identical side effect profile.

This information is for research and educational purposes only. No medical advice.

How it works

Identical to the other tren esters: very high androgen receptor affinity, no aromatization, but progesterone activity (prolactin topic). Once the ester is cleaved, the same trenbolone acts.

Ester comparison

  • Acetate: short, every other day, fastest to control.
  • Enanthate: medium-long, 2x per week.
  • Hexa (Parabolan): longest, 2x per week is plenty, very stable levels.

Dosing

Members only

Dosing recommendations are visible to logged-in members only. Logging in is free.

Log in / sign up

What the research shows

As with all tren esters, the AAS pharmacology applies (Kicman 2008, Hartgens & Kuipers 2004). Compound-specific human studies are scarce since trenbolone is primarily veterinary.

Side effects

  • Prolactin/progestin - cabergoline as countermeasure.
  • Night sweats, sleep issues, aggression.
  • Unfavorable lipids, blood pressure.
  • Strong HPTA suppression - long PCT wait due to the long ester.

Storage

Store the oil solution at room temperature, protected from light - no fridge needed. Out of reach of children.

Practice

PCT / after coming off

Anabolic substances suppress the body's own testosterone production in the research context. Anyone who comes off a cycle (rather than running it continuously) typically uses a post-cycle therapy (PCT) to restart the natural axis (HPTA).

The standard scheme in the research/literature context combines a SERM (tamoxifen and/or clomifene, alternatively enclomiphene) over roughly four weeks, optionally preceded by HCG to re-sensitise the testes before the SERM block. An aromatase inhibitor (anastrozole/exemestane) belongs more to on-cycle estrogen control than to the PCT itself.

19-nor note: nandrolone and trenbolone are progestagenic and can raise prolactin. The literature additionally discusses a prolactin-lowering agent (cabergoline) and a somewhat longer wash-out window here.

Tip: order the PCT items together with the cycle so they are already on hand when you come off.

This information serves research and educational purposes only. Not medical advice.

Evidence

Sources

  1. 1 Pharmacology of anabolic steroids - comprehensive review. Kicman, Br J Pharmacol, 2008
  2. 2 Effects of androgenic-anabolic steroids in athletes. Hartgens & Kuipers, Sports Med, 2004

Keep reading

More in the lexicon

In the shop

Tren Hex (Parabolan) in the catalog

Sizes, prices and availability for research use. Straight from the lexicon to the product page.

View in shop