Trenbolone, also known as trienolone or trienbolone, is a steroid used on livestock to increase muscle growth and appetite. To increase its effective half-life, trenbolone is administered as a prodrug as an ester conjugate such as trenbolone acetate, trenbolone enanthate, or trenbolone cyclohexylmethylcarbonate (Parabolan). Plasma lipases then cleave the ester group in the bloodstream leaving free trenbolone.
Parabolan is trenbolone cyclohexylmethylcarbonate. The half-life of a steroid ester is mostly dependent on its ratio of fat solubility to water solubility: the longer chain the ester, the higher this ratio, and the longer the half-life. This particular carbonate could be most closely compared with an enanthate ester; the half-life is probably a little less than week.
Metribolone (methyltrienolone aka R1881) is a potent, non-aromatizable androgen that is structurally similar to trenbolone and has been referred to as “oral tren.” Methyltrienolone binds strongly to the androgen receptor (AR) and is a more potent agonist (activator) of the androgen receptor than is DHT. 17a-methyltrienolone is listed at 30,000 times more anabolic than methyltestosterone according to Julius Vida in “Androgens and Anabolic Agents: Chemistry and Pharmacology.
Trenbolone is also much more potent than testosterone at suppressing endogenous androgen production. This makes clear the fact that estrogen is not the only culprit with negative feedback inhibition, as here there is no buildup of this hormone to report here.
The steroid Trenbolone Enanthate is the long-releasing concoction of Trenbolone, which is good in boosting strength and increasing lean muscle mass. The ester – Enanthate – allows the trenbolone to slowly be released into the body. It will peak within a few days but can take nearly two weeks before the body full absorbs it.
Trenbolone Acetate, also known as Finaplix, Finaject and Finajet, is a very highly regarded anabolic steroid for building muscle. Trenbolone Acetate needs to be administered on a frequent basis due to its short life. One of the main reasons why this steroid is so popular among those in sports is due to the fact that it does not convert to estrogen in the body.