I realize that 'normal' testosterone levels are usually maintained by 75 mg base test per week, but being a long timer, I am of the theory that when you shut down natural levels, something else is thrown out of balance and then 'normal' blood levels is not enough. I tried 100 mg/5 days for a long time, and I dont why it is but it just did not seem to be enough. When I am on 200 to 250 mg per week everything seems to be a lot better, libido, mental outlook, etc. etc. I know on the lower dose I felt worse than when I was natural with lower levels.