Testosterone Esters and Half-life

Dean Destructo

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Esters and Half-life
Methyl-testosterone (active half-life 6-9 hours)

Methyl-testosterone does not have an ester, but rather it is methylated for oral use and it is the oldest known oral steroid made. Methyl-testosterone was originally used as a prescription drug to treat men with low testosterone levels, although it fell out of favor and has been replaced with injectables since methyltestosterone is quite liver toxic. Gym folklore touts methyl-testosterone as a very strong androgen capable of increasing aggression with one dose when taken right before a workout.

Testosterone base (active half-life 4-6 hours)

Testosterone base (suspension) is an injectable testosterone hormone in a water base that was developed and used for decades, and is actually the first anabolic androgenic steroid made. This is the purest form of testosterone and yields 100 mg of actual testosterone. It is a pure form with no ester attached. A few things to keep in mind with suspension: The injections can be extremely painful. They can be a lot of PIP (post injection pain) when using suspension. There is also a much higher likelihood of estrogen conversion and it needs to be taken very seriously. It is used much differently than other forms of testosterone. The water-based carrier is more prone to breed infection at the injection site than oil-based preparations.

Testosterone Propionate (active half-life: 2-3 days)

Testosterone propionate is one of the most popular single-ester preparations next to testosterone enanthate. Even women who decide to take testosterone will often use testosterone propionate because of its short acting effects. Due to its short half-life the propionate ester should be injected every day or every other day to maintain steady levels. Aside from testosterone suspension, propionate has the shortest ester of any other form of testosterone, providing 83 mg of actual testosterone.

Omnadren

Omnadren is quite similar to the popular testosterone blend known as Sustanon. Omnadren is comprised of 4 different types of testosterone. One 250 milligram ml of Omnadren looks like this:

  • 30mg testosterone propionate
  • 60mg testosterone phenylpropionate
  • 60mg testosterone isocaproate
  • 100mg testosterone caproate (for Omnadren)
  • 100mg testosterone decanoate (for Sustanon 250)
As the longest ester in Omnadren (caproate) is slightly faster acting than the longest ester in Sustanon (decanoate), users will notice an increase in their testosterone levels sooner with Omnadren than with Sustanon.

Testosterone Cypionate (active half-life: 6-7 days)

Testosterone cypionate is probably the most popular and widely used form of testosterone. Cypionate is the esters doctors generally recommend for TRT and HRT treatment from doctors. It is desirable because it can be injected once a week as opposed to twice and is a very smooth injection. Each 100mg shot of Cypionate yields approximately 70 mg of actual testosterone once the ester is cleaved off.

Testosterone Enanthate (active half-life: 5-7 days)

Testosterone Enanthate is also one of the more prevalently used forms of testosterone esters. It is quite similar to cypionate, with a small difference being the ester weight is slightly different. Enanthate has a slightly shorter half life and should be injected twice a week. It is very effective and commonly used. Enanthate yields approximately 73 mg of actual testosterone.
Testosterone Phenylpropionate (active half-life 3-4 days)
Phenylpropionate has the shortest duration of all testosterone esters with the exception of Testosterone Propionate. You will need to administer Testosterone-Phenylpropionate three times per week; the first dose will give you lots of energy which will reduce after two days. The second, on the other hand will increase the effects of the hormone in the body, and the third will ensure your blood levels remain stable and peaked. You might be able to get away with two injections per week, and some will find every other day to be extremely useful, but three injections per week is a good protocol to follow. Phenylpropionate yields approximately 66 mg of actual testosterone per 100mg shot.

Testosterone Isocaproate (active half-life 7-9 days)

Testosterone Isocaproate is well known for being part of the popular testosterone blends Omnadren and Sustanon. It is also ideal for TRT or HRT due to the longer half life and once a week injection schedule to keep stable blood levels. Isocaproate yields approximately 72 mg of actual testosterone per 100mg shot.

Testosterone Decanoate (active half-life 12-14 days)

Testosterone Decanoate is well-known as part of the very popular form of testosterone known as sustanon. It is ideal for TRT or HRT users as well as to be stacked with a much longer ester steroid like deca durabolin for less frequent injection schedules. Decanoate can be injected once a week and maintain stable test levels. A 100mg Decanoate shot yields approximately 62 mg of actual testosterone.

Testosterone Undecanoate (active half-life 19-21 days)

Testosterone Undecanoate, also known as undecylenate, is used in androgen replacement therapy primarily for the treatment of male hypogonadism, and is currently under research for use as a male contraceptive. Undecanoate is the longest esteemed form of testosterone you can find and is ideal for users on TRT or HRT. Undecanoate yields approximately 61 mg of actual testosterone per every 100mg shot.
 
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Another great article on testosterone esters. Good read for beginners or refresher for the veterans. Thx DD
 
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