That would all depend on what his previous doses of npp were. probably for him 75mg ed would be ideal but if he ran that much last time or more even than thats why I threw in the 100mged, he should know how to gauge his doses from previous experience. really anything over 600 is a waste but its much easier to just inject 1cc thats dosed at 100mg/ml than measure out all the little lines every time so you get 600mg.