Oral steroids: Drug Active half-life Anadrol / Anapolan50 (oxymetholone) 8 to 9 hours Anavar (oxandrolone) 9 hours Dianabol (methandrostenolone, methandienone) to 6 hours Methyltestosterone 4 days Winstrol (stanozolol) 9 hours Halotestin (Fluoxymesterone) hours Turinabol (Tbol) 16 hours Injectable steroids: Drug Active half-life Deca-durabolin (Nandrolone decanate) 15 days Equipoise 14 days Finaject (trenbolone acetate) 3 days Primobolan (methenolone enanthate) days Sustanon or Omnadren 15 to 18 days Testosterone Cypionate 12 days Testosterone Enanthate days Testosterone Propionate days Testosterone Suspension 1 day Winstrol (stanozolol) 1 day Steroid esters: Drug Active half-life Formate days Acetate 3 days Propionate days Phenylpropionate days Butyrate 6 days Valerate days Hexanoate 9 days Caproate 9 days Isocaproate 9 days Heptanoate days Enanthate days Octanoate 12 days Cypionate 12 days Nonanoate days Decanoate 15 days Undecanoate days Ancillaries: Drug Active half-life Arimidex 3 days Clenbuterol days Clomid 5 days Cytadren 6 hours Ephedrine 6 hours T3 10 hours Letrozole 5 hours Nolvadex (Tamoxifen Citrate) 14 days
For the off-season athlete there is no anabolic steroid more important or beneficial than testosterone. High levels of testosterone will promote significant increases in lean muscle mass and strength. This is assuming that the individual is consuming adequate calories. Compounds like Testosterone Propionate are not magical, you will still need to feed your body enough calories. During an off-season period of growth, this means total caloric intake will need to be slightly above maintenance. This will, unfortunately, promote body fat gain. However, the key to a successful off-season is gaining lean tissue while minimizing body fat gain to the fullest extent possible. By supplementing with Testosterone Propionate you will be able to achieve this more efficiently. High testosterone levels will promote a stronger metabolic rate. This is not a license to eat like there’s no end in sight, but you should be able to make better use of your calories.