There are many different esters that are used with anabolic/androgenic steroids, but essentially they all have the same function. Esters vary only in their ability to cut a steroid's water solubility. An ester like propionate for example will slow the discharge of a steroid for a few days, while the duration will be weeks with a decanoate ester. Esters have no effect on the affinity for the parent steroid to convert to estrogen or DHT nor will it affect the overall muscle-building potency of the compound. Any differences in results and side effects that may be noted by bodybuilders who have used various esterified versions of the same base steroid are just issues of timing.
Testosterone enanthate causes estrogen related problems more readily than Sustanon, simply because with enanthate testosterone levels will peak and trough much sooner. Similarly testosterone suspension is the worst in regards to gyno and water bloat because blood hormone levels peak so rapidly with this drug. Instead of waiting weeks for testosterone levels to increase to their highest point, here the action is just a couple of days. Given an equal blood level of testosterone, there would be no dissimilarity in the rate of aromatization or DHT conversion between different esters. However esters do technically effect potency by calculating the steroid weight. The heavier the ester chain, the greater is its percentage of the total weight. In the case of testosterone enanthate for example, 250mg of esterified steroid is equal to only 180mg of free testosterone. 70mgs out of each 250mg injection is the weight of the ester. If we want o be really selective, we could consider enanthate slightly more potent than cypionate as its ester chain contains one less carbon atom and therefore taking up a slightly smaller percentage of total weight. Propionate would of course come out on top of the three, releasing a measurable amount more testosterone per injection than cypionate or enanthate.
Testosterone enanthate causes estrogen related problems more readily than Sustanon, simply because with enanthate testosterone levels will peak and trough much sooner. Similarly testosterone suspension is the worst in regards to gyno and water bloat because blood hormone levels peak so rapidly with this drug. Instead of waiting weeks for testosterone levels to increase to their highest point, here the action is just a couple of days. Given an equal blood level of testosterone, there would be no dissimilarity in the rate of aromatization or DHT conversion between different esters. However esters do technically effect potency by calculating the steroid weight. The heavier the ester chain, the greater is its percentage of the total weight. In the case of testosterone enanthate for example, 250mg of esterified steroid is equal to only 180mg of free testosterone. 70mgs out of each 250mg injection is the weight of the ester. If we want o be really selective, we could consider enanthate slightly more potent than cypionate as its ester chain contains one less carbon atom and therefore taking up a slightly smaller percentage of total weight. Propionate would of course come out on top of the three, releasing a measurable amount more testosterone per injection than cypionate or enanthate.