GP Test Prop 100 by Geneza Pharmaceuticals is injectable steroid which contains the hormone Testosterone Propionate in preparations of 100mgs per ML. The Propionate 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 the steroid 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 Propionate tends to induce far fewer estrogen related side effects such as bloat than do the other esters of this powerful hormone. Testosterone 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. Testosterone 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. Testosterone 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 Testosterone, 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 (800-1200mgs) 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. Bodybuilders looking to bulk up, often stack GP Test Prop 100 with other steroids such as GP Deca 250 and/or GP Bold 200, along with an oral compound such as GP Methan or GP Oxy. Those Bodybuilders looking to use testosterone during cutting phase, might wish to stack it with compounds such as GP Trens, along with an oral like GP Stan or GP Oxan. Testosterone 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 testosterone 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 this steroid would typically be in 400-1200mg 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 50-100mgs per week.