Testosterone Propionate

Basic Info.

CAS: 57-85-2
Assay: 99%
Einecs: 200-351-1
Molecular Weight: 344.49
Molecular Formula: C22h32o3
Appearance: White Crystalline
Export Markets: Global
Standard: SGS
HS Code: 1514919000
Production Capacity: 500kg/Month


Testosterone propionate is a commonly manufactured, oil-based injectable testosterone compound. The added propionate ester will slow the rate in which the steroid is released from the injection site, but only for a few days. Testosterone propionate is therefore comparatively much faster acting than other testosterone esters such as cypionate or enanthate, and requires a much more frequent dosing schedule. While cypionate and enanthate are injected on a weekly basis, propionate is generally administered (at least) every third day. Figure one illustrates a typical release pattern after injection. As you can see, levels peak and begin declining quickly with this ester of testosterone. To make this drug even more uncomfortable to use, the propionate ester can be very irritating to the site of injection. In fact, many sensitive individuals choose to stay away from this steroid completely, their body reacting with a pronounced soreness and low-grade fever that may last for a few days. Even the mild soreness that is experienced by most users can be quite uncomfortable, especially when taking multiple pharmacokinetics of Testosterone propionate injections each week. The "standard" esters like in ection enanthate and cypionate, which are clearly easier to use, are therefore much more popular among athletes.


Testosterone is responsible for promoting health and well-being through enhanced libido, energy, immunity, increased fat loss, gaining and maintaining lean muscle mass, preventing Osteoporosis (loss of bone density) and possible protection against heart disease. Testosterone is also responsible for normal growth and development of male sex organs and maintenance of secondary sex characteristics. Secondary sex characteristics are specific traits that separate the two sexes, but are not directly part of the reproductive system, for example: chest and facial hair, a distinguished jaw line, broad shoulders and increased muscle mass. Testosterone binds to the Androgen Receptors (AR), which thus causes accelerated muscle gain, fat loss, and muscle repair and growth. These mechanisms are stimulated by activation of the Androgen Receptors (either directly or indirectly as DHT).

Side effects:

There are many possible side-effects associated with Testosterone Propionate use. This product has a high level of aromatization into estrogen and coverts to DHT (dihydrotestosterone) as well. Testosterone can convert to estrogen, the female sex hormone, creating a high risk of gynecomastia (formation of breast tissue in males). Also, supplementing Testosterone to your body will result in the shutting down of the body's natural production of the hormone. The severity of side effects depend mostly on the dose and duration of circulating free testosterone and it's conversion to estrogen and DHT. Testosterone's anabolic/androgenic effects are dependant upon also dosage; the higher the dose the higher the muscle building effect. Testosterone typically promotes aggressive and dominant behavior.

User Notes:

Testosterone Propionate is actually my favorite form of injectable testosterone. Anecdotally, this is because in myself as well as other users, this short acting ester would seem to produce far less water retention and a quicker onset of gains. The only down side to this particular form of testosterone is that it must be injected frequently, with many users (myself included) preferring to inject it every day or every other day at a dose of around 100 mg.

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