Testosterone Decanoate 250mg/Ml CAS 94-24-6 with Pump Effect
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All esters have a half-life, so the release of the steroid from the ester will peak and decline at different times depending on the ester. Think of it as a sharp increase followed by a sharp decline in blood serum levels of the steroid being used. This can be a couple of hours or a couple of days.
Like all steroids, testosterone, on its own, has a very short half-life. As a result, manufacturers of synthetic testosterone use a chemical process to attach an ester chain to the testosterone base. The attachment of the ester chain to the hormone makes it oil soluble, while slowing the rate at which the steroid leaves the body. As a results, testosterone cannot attach to the androgen receptors until the ester chain has been cleaved off from the hormone.
In the end, adding the ester chain makes the steroid more manageable for dosing because the shot frequency goes down to only a couple of times per week. This is compared to several daily shots if the base hormone was being injected. The base hormone, without an ester chain, will be in and out of the body in only a few hours. This forces the user to take several daily shot in order to run an effective cycle or TRT treatment.
In order to maintain consistency in the release of testosterone from each injection, the designers of Sustanon 250 used four esters in the same oil carrier. The intention in mixing four esters is to allow for a cascading effect, using the different peaks and troughs of the different ester to keep levels fairly steady. By combining esters of different lengths, they created a somewhat perfect TRT steroid. The shorter propionate ester will peak quickly, while the mid-length ones like phenylpropionate build up, and the shorter-to-mid-length esters decline sharply; at the same time, the longer decanoate ester is just reaching its peak release.