IG- I'm doubt if there is any "clinical" evidence about this..
But you do agree that more frequent injections= more even blood concentration, right?
Well look at drugs like test suspesion compared to test enanthate.. MOst will tell you that there are many more sides that come with suspension. That is because, even if it is injected ED, blood levels fluctuate wildly.
A rational theory for fluctuating blood levels=more sides my be the "spillover theory"
That says that spikes in blood levels are more than what the present ARs can "handle" and more spillover into other receptors and enzymes happens.
THis is the likely cause of excess sides with suspension...
Say for instance you inject 500mg/week of test enanthate.. After enough injections have accumulated, you max out to between 50-90mg of test being through the system per day. This degree of variation decreases as the injections are made more frequent (as I have shown in my mathematical look at injection frequency thread).
When someone injects 100mg of suspension, a much, much greater amount of test goes through the system in one day as compared with 500mg/week enanthate. This amount is less than what the AR's are able to be saturated with and more test is available to bind other enzymes (aromatase) and receptors PR's.
With enanthate, It is very likely that up-regulation happens, at least transietly with the slow duration of enanthate. This is initially due to the increased half life of the AR as a result of a bound substrate.
This is not the case with suspension.. The saturation happens so fast and is gone quickly that it does not yeild nearly the same transcriptional upregulation of the AR gene as a longer acting test does.
these are just my thoughts.. hope this helps shed some light on it..
Andy