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.
Finally, it must be mentioned that any particular ester of Trenbolone does not require a similarly estered anabolic steroid to be stacked with it (for example, Trenbolone Enanthate stacked with Testosterone Enanthate). It is a perfectly fine and safe practice to be able to combine, for example, Trenbolone Acetate and Testosterone Enanthate (instead of Testosterone Propionate ) in Trenbolone cycles. These combinations present no problems and actually work well, but every individual curious about these combinations must always be aware that proper timing, half-life, and injection frequency varies with each of these compounds. The only reason why many individuals prefer to stack Testosterone Enanthate with Trenbolone Enanthate , for example, is because of the convenience aspect and ease of administration frequency and timing (as both compounds are identical in half-life).