This isa repost but gves you a little info...hope it helps.
An interesting side note is that the smaller ester chains, weigh less. This is important because it brings another advantage of shorter chain ester drugs to the table. If the ester weighs less, the amount of testosterone per milliliter or cubic centimeter (cc, they are interchangeable) is more. For example, testosterone suspension is 100% testosterone as we have said previously. It has no ester. The short chain ester propionate, is roughly 74% testosterone. This means that if you take a typical 1cc shot of prop at 100mg/cc, this is actually 74mg of testosterone and 26 milligrams of ester weight. A larger ester such as enanthate, is roughly 55% testosterone. Twenty-eight (45%) percent of the gross weight of a given amount of testosterone enanthate is the actual enanthate ester, not the active testosterone that you are searching for. So, a typical 200mg/cc shot of enanthate only contains 110mg of active testosterone. If you have ever used a shorter acting injectable anabolic, and gotten better results than using heavier dosages of longer acting drugs, this is the reason. You may have been getting more “active” drug into your system with what appeared to be less “overall” or gross mg dosage of drug.
A great illustration of the above point is evident when comparing the "active" amount of testosterone yield in equal "mg" dosages of these two testosterone esters. Think of the 110mg/200mg injection of enanthate. The 74mg/100mg injection of propionate would yield more active testosterone if you were to take "200mg) of the drug. This would yield 148mg of testosterone from the propionate!! Do you see? So, 200mg of propionate is more "active" test than 200mg of enanthate.