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.
Return of endogenous testosterone production is often likely with discontinuation of anabolic steroids, but sometimes, damage may be irreversible. Natural levels of testosterone production may remain low. Consequently, bodybuilders often recommend implementation of a Post Cycle Therapy or PCT plan. The employment of a PCT plan is designed to stimulate natural testosterone recovery. It also assures the availability of a sufficient amount of testosterone for adequate body function, while your levels naturally increase on a continuous basis.