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HALF-LIFE (detection time)


When planning a steroid cycle, it is important to know how long the steroid stays in our body. So we can avoid dosing errors and ensure a relatively stable concentration in the blood and this information is also needed to know when we deploy substances to restore production of testosterone after the cycle.


The length of stay of most drugs in our bodies is called an biological half-life. It is a figure that tells us, after which time the amount of the substance in your body is reduced by half. If anything has a half-life  5 hours and we will take 100 mg, so after 5 hours we have still 50 mg,  after 10 hours 25 mg, and after 20 hours  only 6.25 mg. This time can be influenced by different form, because the same substance have half-life in the form of oral and other (usually longer) in injectable form (an example is stanozolol and testosterone undecanoate). In the chart you can see the status after administration of 200 mg testosterone enanthate (the y-axis is mg and the x-axis are days after application).

ORAL FORMS (tablets)

Substance Half-life
Anadrol/ Anapolan50 (oxymetholone) 8-9 hours
Anavar (oxandrolone) 9 hours
Dianabol (methandrostenolone, methandienone) 4,5 – 6 hours
Methyltestosterone 4 days
Winstrol (stanozolol) 9 hours
Undestor (testosteron undecanoate) 4 – 6 hours




Substance Half-life
Deca-durabolin (Nandrolone decanate) 15 days
Equipoise 14 days
Trenbolone acetate 3 days
Primobolan (methenolone enanthate) 10,5 days
Sustanon or Omnadren (test. mix) 15 – 18 days
Winstrol (stanozolol)* 1 day
Testosteron suspenzia 1 day


* About winstrol we can not talk about classical biological half-life. Due to the slow dissolution of crystals, due to the fact that it is used Stanozolol esterified, blood levels are maintained at approximately constant level, and dissolution drop suddenly.



Ester 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




Substance Half-life
Arimidex 3 days
Clenbuterol 1,5 days
Clomid 5 days
Cytadren 6 hours
Efedrin 6 hours
T3 10 hours


James Stoner 2013