Tren (all forms) is a 19-nortestosterone (19-nor) anabolic steroid. Tren belongs to the same class of steroids as Nandrolone, 19-nor, which refers to the testosterone hormone lacking the carbon atom at the 19^th position. However, with Tren it’s a bit more complex as Tren is simply a modified form of the Nandrolone hormone. Tren is the Nandrolone hormone possessing a double bond at carbons 9 and 11. These double bonds slow the hormone’s metabolism, inhibit aromatization and tremendously enhance its binding affinity to the androgen receptor. These simple yet important changes make Tren one of the most powerful anabolic androgenic steroids of all time. For an appreciation of this steroid’s power we only need to look at its ratings; Tren carries an anabolic rating of 500 and androgenic rating of 500 compared to testosterone that’s 100 in both categories.

Regardless of the form of Tren used the hormone itself is the same. The only difference of true importance is how fast the hormone works, and this is determined by the ester. The ester doesn’t change the actual functions and traits of the Tren hormone. The ester also determines how much active Tren is available per milligram. The larger the ester the more space it takes up in the compound and the less active Tren there is available per milligram. However, with any form you can account for this by adjusting the dose.