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As oil solutions by intramuscular injection, the elimination half-lives of testosterone esters are 0.8 days for testosterone propionate, 4.5 days for testosterone enanthate, 20.9 days (in tea seed oil) and 33.9 days (in caster oil) for testosterone undecanoate, and 29.5 days for testosterone buciclate.
Testosterone, the base androgen of most androgen esters. This is a list of androgen esters, including esters (as well as ethers) of natural androgens like testosterone and dihydrotestosterone (DHT) and synthetic anabolic–androgenic steroids (AAS) like nandrolone (19-nortestosterone).
Testosterone undecanoate, an ester of testosterone and one of the most widely used androgen esters. An androgen or anabolic steroid ester is an ester of an androgen / anabolic steroid (AAS) such as the natural testosterone or dihydrotestosterone (DHT) or the synthetic nandrolone (19-nortestosterone).
Testosterone esters were synthesized for the first time in 1936, and were found to have greatly improved potency relative to testosterone. [12] Among the esters synthesized, testosterone propionate was the most potent, and for this reason, was selected for further development, subsequently being marketed. [ 12 ]
Testosterone buciclate d: C17β: Bucyclic acid e: Cyclic carboxylic acid – (~9) 1.58: 0.63: 7.9–8.5 Footnotes: a = Length of ester in carbon atoms for straight-chain fatty acids or approximate length of ester in carbon atoms for aromatic or cyclic fatty acids. b = Relative testosterone content by weight (i.e., relative androgenic/anabolic ...
Conversely, “with too much testosterone, women often have acne, too much hair on the body, hair loss on the head, high blood pressure, elevated cholesterol, skipped cycles, or problems ...
Testosterone undecanoate has a very long elimination half-life and mean residence time when given as a depot intramuscular injection. [27] [7] [8] Its elimination half-life is 20.9 days and its mean residence time is 34.9 days in tea seed oil, while its elimination half-life is 33.9 days and its mean residence time is 36.0 days in castor oil.
The elimination half-life of DHT in the body (53 minutes) is longer than that of testosterone (34 minutes), and this may account for some of the difference in their potency. [51] A study of transdermal (patches) DHT and testosterone treatment reported terminal half-lives of 2.83 hours and 1.29 hours, respectively. [52]