I taken the full dose recommendation of REZ-V with both Alpha Male and Carbolin 19, and while I didn't "feel" anything with the REZ-V, I did notice that I recovered from little things here and there better such as feeling a cold coming on and after a day being fine.
At the end of the day for me, what's important is not missing training days and being able to train as hard as possible during those days. I did find that with the REZ-V, I was able to nopt miss days and train at a high level. The questions becomes is it feasible at that cost.
I personally get the same effect of feeling good by taking some extra BCAA's and Glutamine even though I know that the REZ-V works on a different mechanism.
For me, one a day seems to do the trick, and I'm mainly taking it for the health benefits anyway, not as a E blocker.