I borrowed this did not write it!
*Note: The determined half-lives are only estimations. After performing a PCT calculation, an error margin of a few days should be considered. If you have any information that may be of aid to us, feel free to email us!
Propionate: 2 days
Reasoning: From analyzing graphs we determined that total testosterone levels began their drop 24 h after a single injection of 50mg testosterone propionate (1). Further analysis discovered levels were halved approximately 2 days after injection, and so that is the estimated half-life of the propionate ester.
Phenylpropionate: 3 days
Reasoning: Data revealed nandrolone phenylpropionate to have a little bit longer of a half-life than that of propionate (2). Although there have not been many studies done using the ester, it's estimated half-life is 3 days.
Isocaproate: 5 days
Reasoning: With a shorter ester than that of enanthate and longer than that of phenylpropionate, the isocaproate half-life is rougly estimated to have a 5 day half-life. This is based on the carbon composition of the ester alone as there exists very little known studies on this ester.
Enanthate: 7 days
Reasoning: From analyzing many graphs and data tables concerning the half-lives of testosterone enanthate(1, 4, 5), it was concluded that the half-life was measured to be about 7 days. We noted that weekly injections of 200mg TE resulted in a continual rise in total testosterone levels until it plateaued at 12 weeks (3). The total testosterone levels between the 8th and 12th week were not significantly different signifying that an estimated half-life of 7 days properly fit the calculated predictions for testosterone levels.
Cypionate: 7 days
Reasoning: Differing from enanthate by only 1 carbon atom, the cypionate ester has no noticeable changes in half-life from enanthate (1). Thus it shares the same, 7 days.
Decanoate: 9.5 days
Reasoning: Being 3 carbon atoms longer, this ester should have an extended half-life over enanthate. This is shown evidently in studies done on single-shot injections of Nandrolone Decanoate (3). The half-life varied from 7-12 days leaning more towards 12 days depending on injection site. We took the average of that which was 9.5.
Undecanoate: 34 days
Reasoning: From detailed graphs and also clinically calculated half-lifes in (1), the estimated half-life of the undecanoate is an impressive 34 days. Definitely not an ester to use for short cycles.