I will argue till the day I die that you won't notice a damn but of difference between ED and EOD shots of prop. The prop is a 3 day ester so every 3rd day is FINE. All this talk about blood levels being stable. Well, on a full printed out blood test, yes, you may see nice stable numbers, but in the real world, you don't know a damn thing is going on between ED and EOD or every 3rd day for that matter. I been on test prop exclusivly for 4 years straight at every 3rd day and it works mighty fine.