pre workout

I started to do fasted morning cardio and taking a pre workout before hand that has some stimulants in it. It seems to be working well for me but i also am interested in ostazol. Should I combine the supplements or can I only run one at a time, I don't want to get too greedy and ruined my progress

have anyone on here ever try the Rich Piana pre workout called kill it. I got a sample of it and used it and it didn't do much for me before my workout, maybe I just need to use it for more than a few days I'm not sure. It did taste pretty good though. I'm or am I better off just taking a Red...