a little article i found on the topic...
If a steroid user uses a long acting testosterone (such as testosterone enanthate), they will inject it once or twice each week. At the end of each week, the long acting ester has tapered down to its original levels and threatens to drop below that level if a new injection is not made. With sustanon, this is not the case due to it's blend of four esters, including the two short ones - propionate and phenylpropionate. As a result of these two shorter esters, more frequent injections are necessary to keep stable blood levels are make full use of all esters in the blend. If a user injections sustanon only once per week for example, full use is not as easily made of the propionate and phenylpropionate esters which release quickly and taper off at a faster rate due to their shorter half lives. The issue of sustanon injections remains heatly debated online. Many users claim that injection only twice a week or even once a week is sufficient for sustanon. However, from my experience, many of these same users are running high quantities of sustanon (as much as 750mg and more each week). The logical conclusion here is that sustanon can be injected only once a week, but as stipulated above, this is done only at the loss of the shorter acting propionate and phenylpropionate esters. Injection one gram of sustanon weekly will still take full advantage of the shorter acting isocaproate and decanoate esters which combined account for 64% of the total blend. 64% of 1000mg weekly is equal to 640mg of active steroid which, in my opinion, can be achieved through more frequent injections at a lower dose to optimize the effect of the short acting esters, accounting for a total use of 100% of the blend. Every other day, or daily injections is the best way to insure the maximum effects of all four esters in the blend.
