You can use more than 75 mg of test per week, that dose isn't going to do crap. Under 200 mg forget about it. Go by what your bloodwork tells you. I've used 500 mg of test for over 2 years straight with zero changes in blood work, it stayed perfect. I get labs drawn every 3 months so I'm always on top of it. I add in primo, mast, anavar, Winstrol when I feel like it. If you're concerned about health just bump your test up and down and stick with that. I feel fantastic on 500 mg of test all the time.