man were not even talking about tesosterone its about esters and there structure and how they can effect people differently.
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I've already had input on esters, but for your benefit I'll re-post:
The esters attached to the testosterone molecule are all made of the same basic elements, Carbon Hydrogen and Oxygen. Just about the only difference is the length of the ester in terms of the number of carbon atoms it contains. The carbon atoms form the 'backbone' of the ester with little hydrogen atoms poking off it, A basic Hydrocarbon structure. Basically an acid, the carboxylic acid is added to the alcohol group on the testosterone molecule to form a bond. This bond between the testosterone molecule and the acid is called an ester bond so technically when we refer to the "ester" we are referring to the carboxylic acid part of the molecule.
There are two types of enzymes which can cleave this bond, esterases and hydrolases(sp?) they can remove any type of ester whether it be prop, enanth or cyp. This is because the enzymes target the 'ester bond' so regardless of how long the carboxylic acid group is or its composition the bond is the same for each ester of testosterone. I don't know how correct my assumption is because I couldn't find much research on the matter but what I assume is that this is why time to reach the peak concentration of testosterone in the blood is the same regardless of ester length. The length of the ester doesn't determine the speed at which the ester is cleaved off the testosterone molecule but influences its solubility, so longer esters mean that it takes longer for the molecule to get absorbed into the blood stream where it can be exposed to the enzymes which remove the ester.
To be more precise: When in aqueous environment (away from oil, and depending on where injected, intramuscular fat) the ester is hydrolyzed yielding free steroid that is quickly taken up into circulation, where is diffuses cellular membrane, binds receptor, triggers response...
To re-iterate on esters and effects on different people: Typically any ester, administered in an appropriate dose, over the appropriate half-life time,
should deliver the testosterone in a similar way and should differ very little in rate of metabolization..
To effect unnecessary sides from any esterified compound: You'll see more aromatization with higher fluctuation (less frequent injections than half-life) with any ester.
As I've mentioned previously, injection frequency in relation to a compounds half-life, effect sides to a greater degree than esters themselves...!!!!!!!!.. in most cases