Sustanon 250 can produce very quick results. It consists of four testosterone esters, each with a different half-life. These include testosterone propionate, testosterone phenylpropionate, testosterone isocaproate and testosterone decanoate.
Testosterone propionate is the first one to kick in within 24-48 hours of getting injected, providing the initial boost. This is followed by Isocaproate which has a half-life of 4 days. The next to kick in is phenylpropionate which can take from one to three weeks to completely release into the bloodstream. It is testosterone decanoate that kicks in the very last. It has a half-life of 20 days and keeps the effects of Sustanon until quite long.