i could definitely see Hemavol helping during cardio.
jsut depends if you may go hypo from agmatine. Some will get that
stim wise i agree with all the other replies.
its a very slight mental focus from it, yet non stim I loved the compete and hemavol stack. I happen to get a nice kick from high doses of carnitine (im one that can not take it late at night as it interferes with my sleep but it makes a great replacement for my caffeine in the AM