B-Testosterone Deca 500mg 10ml is a steroid-based injectable solution used by bodybuilders and athletes. It contains Decanoic acid (Decanoate), an anabolic steroid, in a liquid suspension. Sale of B-Testosterone Deca 500mg 10ml is banned in many countries and restricted in many others. It is used for bulking and cutting cycles, as it increases muscle mass and strength while reducing body fat. Some common side effects include increased aggression, elevated blood pressure, increased risk of liver damage, and increased risk of heart attack and stroke.