Actually, the ester that is attached to the testosterone really has nothing to do with how often you "need" to inject. Injection frequency is literally a peronsal choice and can be done ED, EOD, 2x week, etc...You may be able to pin less frequently with longered estered cmpds, which I will get into, but there is certainly nothing wrong with injection enanthate, decanoate esters (these are the longer esters) every day.
Again, this is another myth that has been perpetuated forever and should be dispelled. The difference in esters relates to the bodies ability to break down that attached protein, in this case we are talking about Testosterone. When shorter esters are attached to Test the body can cleave the attached esters rather quickly and then begin the metabolic processes to breakdown and utilize the test. The opposite is true when longer esters are used, it takes longer for the body to work its way through the ester and get to the active ingrediant. Basically, shorter esters will produce visible results quicker bc the active ingrediant is viable sooner and can have its intended effect within the body. Following this logic, it can also be said that the shorter estered cmpds will be excreted more rapidly as well. So a benefit that is preached is that if you find you are having harsh side effects, a shorter ester will be metabolized quicker and out of the body (so to speak) sooner so the side effects won't last as long (if you are experiencing them).
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There is another fact that needs to be discussed and that is the nature of fast hitting vs slow hitting cmpds. And this goes for anything not just steroids, I am referring to any cmpd you ingest, inject, snort, etc. The faster the product enters the body (I don't mean how fast you inject or snort it) I mean the faster the active product is released from the ester, the faster it is metabolized, and the faster those metabolites are released. So a fast acting Test like Cyp or Prop will cause estrogen levels to rise a lot quicker than say an enanthate ester. Understandably, a spike in testosterone will cause a spike in estrogen as it is a main metabolite of test. This fact does is not necessarily a bad thing, just something to consider when adjusting doses of your ancillaries. You will need to take an AI almost every day at a higher dose (typically) when using short esters to combat the spikes in estrogen. Longer esters tend to produce metabolites slower, so a less frequent dosing protocol can be used. This is why I preach patient specific medicine and always ask what steroids a person is taking and their goals bc I can then go on to give them a much more specific regimen that suits their needs and one that will produce little to no side effects, rather than posting the typical protocols we see every time.
I know this is long, my posts tend to be but the information needs to be cleaned up and the main reason I post to these sites is to help dispel the rumors and false information that is so readily available. Not that evo has this problem specifically, but no site is free of it. I also, do not have the answer to every question. They say "the wise speak only of what they know" so I tend to stick to items I am proficient with. Hopefully, this helps clarify your choice of esters and once you do decide, I have no problem helping you with doses for you ancillaries.
Thanks,
Fit_PharmD