Test Prop is injectable steroid which contains the hormone Testosterone Propionate in preparations of 100 mg per ML. Test Prop 100 is a very popular choice of testosterone for cycles that include other quick esters so they all leave the body at the same time when cycle is over. Commonly used during diet periods since it retains less water than slower esters. The Test Prop 100 ester is much faster acting (2-3 days) than Enathate or Cypionate, and thus requires a more frequent injection schedule such as every day or every other day in order to keep blood levels as stable as possible. The benefit to this however, is that Test Propionate can be cleared from the body much more quickly after use is discontinued, thus making it a more preferable choice for tested athletes. Some bodybuilders also claim that Test Prop 100 tends to induce far fewer estrogen related side effects such as bloat than do the other esters of this powerful hormone. Test Prop 100 is the most common anabolic hormone that there is and is also considered the most basic. Due to this, bodybuilders often consider it the base steroid to most all cycles. Test Prop 100 is both anabolic and androgenic in nature.

Users of this steroid will notice a dramatic gain in muscle size and strength, as well as an overall sense of well being and increases libido and sex drive. Test Prop 100 aromatizes very easily and therefore estrogen buildup and side effects can become an issue for users sensitive to these problems or those choosing to use a high dose of this compound. Therefore, when using Test Prop 100, bodybuilders often choose in incorporate an anti-estrogen such as Anastrozole, Proviron, Tamoxifen to help keep estrogen related side effects to a minimum. Extremely sensitive users, or users using very high doses (800-1200 mg) might find that stronger anti-estrogens such as Letrozole or Exemestane are more suitable. Androgenic side effects such as oily skin are also possible while taking Testosterone Propionate.

Test Prop 100 use will quickly shut down the body's natural production of the hormone, thus making a proper PCT plan essential for restoring the body's natural function and maintaining gains as best as possible after use of the steroid has been discontinued. At cycle's end, bodybuilders often choose to use a combination of Clomid, Tamoxifen, and HCG for a period of 3-4wks in order to restore pituitary gland and testes operation quickly and effectively. Woman bodybuilders often use Test Prop 100 to build mass, although of course the dosage is significantly less than what males would use due to the possibility of masculizing side effects. The male bodybuilder's dosage of Test Prop 100 would typically be in 400-1200 mg per week range and cycle duration would be from 8-20 weeks, depending of course on the goals of the athlete. Women typically see desirable results from doses of 50-100 mg per week.