After my heart attack about a month and a half ago I asked my doctor what could have caused this to happen to me. Her answer was that Test makes blood very thick and if you have any sleep apnea at all it can also cause thick blood. I did notice (as you can see in previous posts of mine) that my face was very red alot of the time and that I would somehow get sunburned more easily. A sign of too much blood circulating in my body. My doctor (she is way cool) told me that it would have been better to take Test with some aspirin to stop any possibility of clotting or at least decrease the chance. So take it for what its worth. Just trying to keep another brother or sister from going through what I went through.