How much are you cruising on? How are your hemocrit levels? Thats the one thing that really worries me about this stuff. I never gave it much though when I was younger but as I get older it becomes more of a concern. A lot of guys seem to start having issues in their 40s and 50s.41 yrs old. I've been doing a little more then what the doctor prescribed . That's why my levels are so high. Probably not the best idea but I'm honest with him when I do so he can monitor me.