I've been on this for about a week now. I've tried AP in the past and with that one, I could feel the "pump", as it were, from that. I could feel like veins in my left forearm bulging out. I had expected something similar and it does occur, only not as pronounced. I take it in the morning before my morning shake (~300mg) and then before my post-workout shake (~400mg). Too soon to know if anything's going on. Taste isn't so bad. Tastes like unsweetened Nestea.