I have been on HRT since 2006 and I think I'm in the best shape of my life. I get blood drawn every 4 weeks and due to a heavy schedule it's been 6 weeks and my RBC was 20.0. That's the highest I have ever seen. Since I do feel great, workout, and run dailey, I wonder if giving blood than often is good for the body. I have read that giving blood 3 times a year cuts a mans chance of having a heart attack in half. I am just trying to find the happy medium. I don't won't to wear out my blood making cells.