Some bodybuilders and athletes use trenbolone esters for their muscle-building and otherwise performance-enhancing effects.  Such use is illegal in the United States and many other countries. The DEA classifies trenbolone and its esters as Schedule III controlled substances under the Controlled Substances Act .  Trenbolone is classified as a Schedule 4 drug in Canada  and a class C drug with no penalty for personal use or possession in the United Kingdom .  Use or possession of steroids without a prescription is a crime in Australia .  The infamous "duchess" cocktail administered to Russian athletes at the Sochi Winter Olympics consisted of oxandrolone , a metenolone ester, and a trenbolone ester. 
As you know everything has its positive and negative sides. Trenbolone also have some adverse effects. Because it is a powerful steroid its effects will be harsh too. Trenbolone does not aromotize but even if it does not aromotize, gynecomastia can still occur due to tren being of a high progestin nature. For those who are sensitive to gynecomastia a good aromatase inhibitor is advised. Trenbolone can also be a cause of increased blood pressure. It can also cause hair loss to the men who are genetically predisposed. It means that you were already going to get bald trenbolone just did it at an earlier stage. If you have blood pressure problem don’t use trenbolone because it might get worse. People who are healthy and have healthy diet can control blood pressure.
For the off-season athlete there is no anabolic steroid more important or beneficial than testosterone. High levels of testosterone will promote significant increases in lean muscle mass and strength. This is assuming that the individual is consuming adequate calories. Compounds like Testosterone Propionate are not magical, you will still need to feed your body enough calories. During an off-season period of growth, this means total caloric intake will need to be slightly above maintenance. This will, unfortunately, promote body fat gain. However, the key to a successful off-season is gaining lean tissue while minimizing body fat gain to the fullest extent possible. By supplementing with Testosterone Propionate you will be able to achieve this more efficiently. High testosterone levels will promote a stronger metabolic rate. This is not a license to eat like there’s no end in sight, but you should be able to make better use of your calories.