I can tell you guys this 100% for sure for me at 600mg of eq if you do a blood test to check your levels over a 12-16 week span your test level will be raised quit high at 600mg of EQ a week mine were but everyone is different. Also at 600mg a week is what I took for many years it raised both my hemoglobin and hemocrit quit high. And Im just a prop eq guy.