Testosterone is the male sex hormone that is synthesized from cholesterol by the Leydig cells of the testes. It is the sex hormone responsible for male sexual characteristics and the continued sexual health of men. The hormone also has an anabolic action which leads to increased muscle mass and reduced fat deposition. For bodybuilders and athletes, testosterone is one of their favorite steroids they use to increase the process of muscle gain, fat loss and exercise tolerance. Testosterone can be used alone but better results are got when used with other anabolic steroids. Testosterone stacking leads to a faster and greater manifestation of the benefits.
Testosterone is normally stacked with any steroid. This is because other anabolic steroids lead to reduced production of endogenous testosterone. The steroids are usually broken down to release testosterone which then acts on the pituitary gland and gives a negative feedback. The result is reduced levels of follicle stimulating hormone and luteinizing hormone which usually activate production of testosterone. For this reason, Testosterone is added to all stacks to provide an exogenous source of the hormone. Testosterone is thus very versatile.
During the bulking phase, testosterone can be stacked with one of the strongest steroids, Trenbolone. Trenbolone is 5 times as potent as testosterone. It increases the production of erythropoietin in the kidneys and overall increased red cell production. This is particularly important to the muscles which are exposed to anabolic conditions during intense exercises. With increased red blood cells, there is increased oxygenation. As a result, there is less lactic acid produced and less muscular injury.
Testosterone stacking can also be done with the very potent anabolic steroid Dianabol. This combination is preferred by bodybuilders who want to gain bulk fast. For people who want a milder combination, using Anavar instead, is recommended. Using a testosterone and Dianabol stack leads to water retention and for this reason adding an Aromatase inhibitor to the stack is suggested.
Testosterone provides an exogenous source of the hormone in testosterone stacking. This explains why for any stack to work and cause fewer side effects, testosterone is usually part of it.