As a result, Trenbolone Acetate now functions as the primary anabolic compound (aka the ‘workhorse’ compound) that will function to provide the muscle growth throughout the cycle. Trenbolone is strictly an advanced level anabolic steroid, unfit for use by beginners of any type. In this cycle, the Acetate variant of Trenbolone is utilized simply due to its seamless compatibility with Testosterone Propionate. This is because the Propionate and Acetate esters as, previously mentioned early on in this section of the profile, both possess almost identical half-lives (3 days for Trenbolone Acetate and days for Testosterone Propionate). This therefore provides an ease of convenience for the user, as well as smoother injection and administration frequencies. The fact that Testosterone is being utilized at a low enough doses to avoid aromatization, combined with the fact that Trenbolone’s inability to convert into Estrogen at any dose should result in the total elimination of any potential water retention, bloating, gynecomastia or any side effects associated with Estrogen . It is important to note that this cycle in particular is strong enough to be utilized as a bulking cycle, lean mass cycle, or cutting cycle – all without the inflated potential for water retention or other Estrogenic side effects .
Testosterone propionate was introduced in 1937 by Schering AG in Germany under the brand name Testoviron .  It was the first ester of testosterone to be introduced,  and was the major form of testosterone used medically before 1960.  In the 1950s, longer-acting testosterone esters like testosterone enanthate and testosterone cypionate were introduced and superseded testosterone propionate.  Although rarely used nowadays due to its short duration,  testosterone propionate remains medically available and is still marketed in the United States .