Oral trenbolone is incredibly hepatotoxic, and even short cycles can take a toll. For this reason, most people prefer injectable Tren steroids. If you are interested in avoiding injections, though, and you want to use Tren oral, use the smallest possible dose that provides results for the shortest period possible. Be sure to also incorporate some liver protection into your cycle, whether you choose to use milk thistle or a specially-formulated liver care product. Overall, though, the consensus is that both oral and injectable Tren provide the same results at the same doses.
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.