Most anabolic cycles especially bulking cycles has some form of testosterone at it’s base. This testosterone is used in combination with another anabolic steroid which can be either oral or injectable.
Sustanon is an oil based testosterone blend which is made up of four different testosterone esters. An ester basically means the substance that the testosterone is attached to. In most cases it is usually some form of oil base liquid. The ester the testosterone attached to will determine how long it stays active in the blood.
Most common forms of testosterone include long acting esters cypionate and enanthate. Sustanon’s advantage over these two is that sustanon also contain short-acting ester testosterone in the form of testosterone propionate. When sustanon is injected testosterone-propionate will be the first of the four that will be released into the bloodstream.
Sustanon was made with the intention to yield an even blood testosterone level rapidly and for a prolonged period of time. Generally, the longer the ester, the slower speed of onset and the longer the active-life of the testosterone in the body.
Sustanon has the following four esters listed from smalest ester to largest and also quickest to slowest releasing:
- Testosterone propionate
- Testosterone phenylpropionate
- Testosterone isocaproate
- Testosterone decanoate
So in theory one of the main reasons why some athletes may choose to cycle with sustanon is because they get the best of both worlds meaning they get the benefit of the fast acting esters like propionate which means they will quickly begin to experience the effects of the test in the body but they also get the benefits of the long acting esters which means they will be able to pin only once or twice per week but will be able to experience the test in their system for weeks after injection because of the longer acting esters.