The actual cause of depression is not yet clear. However, doctors and scientists believe that it is a result of an imbalance in the chemicals signaling the brain. Studies are ongoing to identify the imbalance and the signaling chemicals. Various illnesses and some adverse life situations may spark depression. However, a majority of men with lower testosterone levels also exhibits depression signs. Most of them are obese or overweight. It points out the relation between depression and body fat. Average testosterone levels may reverse the situation for men.
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.