Injectable steroids are injected into muscle tissue, not into the veins. They are slowly released from the muscles into the rest of the body, and may be detectable for months after last use. Injectable steroids can be oil-based or water-based. Injectable anabolic steroids which are oil-based have longer half-life than water-based steroids. Both steroid types have much longer half-lives than oral anabolic steroids. And this is proving to be a drawback for injectables as they have high probability of being detected in drug screening since their clearance times tend to be longer than orals. Athletes resolve this problem by using injectable testosterone early in the cycle then switch to orals when approaching the end of the cycle and drug testing is imminent.
In bodybuilding circles trenbolone is often used as a dietary steroid or for competitions. The lack of estrogen effect ensures remain low the female sex hormones. This prevents a fat and water retention. To potentiate this effect further , bodybuilders use Trenbolone often in combination with testosterone propionate as anabolic / androgenic basis. Other steroids which are used for such combination fluoxymesterone , Drostanolon propionate and stanozolol . Frequently aromatase inhibitors such as anastrozole, exemestane and Lestrozol be added the stack to ensure liesten a high androgen levels and to keep estrogen levels low.