Ester weights and active lives

Ester weights and active life.

The mgs below are the estimated amount of active hormone you get per 100mg of ester and active hormone.

Boldenone base: 100mg
Boldenone acetate: 83mg
Boldenone Propionate: 80mg
Boldenone Cypionate: 69mg
Boldenone Undecylenate: 61mg

Clostebol Base: 100mg
Clostebol Acetate: 84mg
Clostebol Enanthate: 72mg

Drostanolone Base: 100mg
Drostanolone Propionate: 80mg
Drostanolone Enanthate: 71mg

Methenolone Base: 100mg
Methenolone Acetate: 82mg
Methenolone Enanthate: 71mg

Nandrolone Base: 100mg
Nandrolone Cypionate: 69mg
Nandrolone Phenylpropionate: 63mg
Nandrolone Decanoate: 62mg
Nandrolone Undecylenate: 60mg
Nandrolone Laurate: 56mg

Stenbolone Base: 100mg
Stenbolone Acetate: 84mg

Testosterone Base: 100mg
Testosterone Acetate: 83mg
Testosterone Propionate: 80mg
Testosterone Isocaproate: 72mg
Testosterone Enanthate: 70mg
Testosterone Cypionate: 69mg
Testosterone Phenylpropionate: 66mg
Testosterone Decanoate: 62mg
Testosterone Undecanoate: 61mg

Trenbolone Base: 100mg
Trenbolone Acetate: 83mg
Trenbolone Enanthate: 68mg
Trenbolone Hexahydrobenzyl Carbonate: 65mg*
Trenbolone cyclohexylmethylcarbonate: 65mg*

Drug Active half-life

Anadrol / Anapolan50 (oxymetholone) 8 to 9 hours
Anavar (oxandrolone) 9 hours
Dianabol (methandrostenolone, methandienone) 4.5 to 6 hours
Methyltestosterone 4 days
Winstrol (stanozolol) 9 hours

INJECTABLE STEROIDS Drug Active half-life

Deca-durabolin (Nandrolone decanate) 15 days
Equipoise 14 days
Finaject (trenbolone acetate) 3 days
Primobolan (methenolone enanthate) 10.5 days
Sustanon or Omnadren 15 to 18 days
Testosterone Cypionate 12 days
Testosterone Enanthate 10.5 days
Testosterone Propionate 4.5 days
Testosterone Suspension 1 day
Winstrol (stanozolol) 1 day

STEROID ESTERS Drug Active half-life

Formate 1.5 days
Acetate 3 days
Propionate 4.5 days
Phenylpropionate 4.5 days
Butyrate 6 days
Valerate 7.5 days
Hexanoate 9 days
Caproate 9 days
Isocaproate 9 days
Heptanoate 10.5 days
Enanthate 10.5 days
Octanoate 12 days
Cypionate 12 days
Nonanoate 13.5 days
Decanoate 15 days
Undecanoate 16.5 days

ANCILLARIES Drug Active half-life

Arimidex 3 days
Clenbuterol 1.5 days
Clomid 5 days
Cytadren 6 hours
Ephedrine 6 hours
T3 10 hours


Good post…needs to be a ‘Sticky’.


Good post but I have to say that those half lives of esters have been shown to be quite wrong. The esters from that particular list were never actually tested and the numbers are based on some loose math by a guy named Bill Roberts. Bill Roberts never had any human testing done and the results… well he got those from his math and some petri dish solutions.

I wrote an article about this exact thing not too long ago… I have put it down below.

The math and scientific reasoning that Bill Roberts used was just dead wrong. All of his calculations were based on the ester itself, outside the body and no included compound. How the hell is that accurate at all?!

Well I continued my research and found that there has been real world testing of compound half lives, ester half lives and the half life of them after they have been combined in different combinations. I also learned that there is a big difference in the different classifications of half lives and those play an important role as well.


Biological effective half life: It is the time in which the pharmacological effect of the drug and its active metabolites falls by one half or 50%.

Elimination half life: It is the time in which the total amount of drug within the body, after equilibrium of plasma with other compartment (fat/muscle), falls by one half or 50%.

Plasma half life (t 1/2): It is the time in which the concentration of the drug in plasma fall by 50%.

So moving forward I found this list of half lives that have been tested on human beings, not just played with on paper with some bad math.


Propionate: 0.8 days
Acetate: 1 day
Phenylpropionate: 1.5 days
Isocaproate: 4 days
Enanthate: 4.5 days
Cypionate: 5 days
Decanoate: 7.5 days
Undecanoate: 20.9 days

I also found that exact compounds were tested and this list was produced…

Testosterone Phenylpropionate: 1.5 days
Testosterone Isocaproate: 4.0 days
Testosterone Enanthate: 4.5 days
Testosterone Cypionate: 5.0 days
Testosterone Decanoate: 7.5 days
Testosterone Undecanoate: 20.9 days
Trenbolone Acetate: 1.0 days
Trenbolone Enanthate: 4.5 days
Masteron Propionate: 0.8 days
Masteron Enanthate: 4.5 days
Nandrolone Phenylpropionate: 1.5 days
Nandrolone Decanoate: 7.5 days
Equipoise: 14.0 days
Primobolan Oral: 5 hours
Primobolan Injectable: 4.5 days
Halotestin: 7 hours
Anadrol: 14 hours
Dianabol: 5 hours
Turinabol: 16 hours
Winstrol Oral: 8 hours
Winstrol Injectable: 1.0 days
Anavar: 10 hours
Superdrol: 10 hours


It’s important to note that this is all baseline and each person is going to metabolize not only compounds but also their esters differently. You can better understand this with more research on the classifications of half lives.

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I’m lost,your list is the first one I’ve seen with let’s say, test E at 4.5 days


This has been posted a couple of times.
I will pin it up in steroid profiles

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As with you everything else has a substantialy shorter Ester, most of the list from either of you dudes is not backed up by any scientific evidence

I know it probably is. Most people have shared the same list that Raphael has for years. No offense to him but all too often this list just gets regurgitated over and over again. So often that most of us, including myself, came to believe it as the end all be all list. It just so happens to turn out to be almost entirely useless. The math and way that Bill Roberts went about accumulating this knowledge was not scientific or medically correct. It was just flawed math.

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And I know there is not much to evidence to back up either

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That’s also true. Aside from testing yourself and running bloods there is no way to really be 100% certain that you’re metabolizing the ester/compounds exactly as these lists state. That’s why I always pin short esters daily and long esters every 3.5 days. Then I can’t be wrong right lol

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Yes @Ironside I get it but wher is what you stated proof

Yes @Bigmurph but where other solid proof

Behre HM, Nieschlag E. 1998 Comparative pharmacokinetics of testosterone esters. In: Nieschlag E, Behre HM, eds. Testosterone: Action, Deficiency, Substitution, ed 2. Berlin: Springer-Verlag; 329–348.

Those are my references.

This is the math used throughout the studies.

The formula used for calculating the rate of compound release at a given day t is:

λ * N(t)
Where λ is the decay constant equal to ln(2)/h, h being the half life of the compound given in days; and N(t) is the half-life equation given by:

N(t) = n * e^(-t/λ)
Where n is the original dose of the compound in mg and t is given in days.


Ok got it thanks

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Look up ester weights on pub med

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Will do

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It really is Amazing even my Bayer testoviron says right In the pamphlet that you only get 185mg/ml from an amp


My TRT endo has me doing TE every 5 days.

Good read. I think people for get that shorter esters give more active testosterone per injection but still have to be injected more frequently. So its hard to decide whats better, less hormone and less injections, or more hormone and more frequent injection. What ester becomes most cost efficient?? I like middle esters the best personally.

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