The highest test i have ever run was 750. Personally i dont like to run more the 500-600 because of the estrogen levels raising and droping. I have read many different views about this subject. Not to mention i bulk so fast, tough for me to cut, have to kill myself. Right now i am about 218. I am only 5'9. Certain areas of my body just keep growing it is annoying in some ways. My chest and arms and shoulders bulk so quick. My back is always lacking, that is why i do it twice a week.