While food, protein powder, multi, and creatine would be better investments...if you want to take NO, then...below are how I'd rank them (the ones I've used) based on price and effectiveness: 1. Universal Shock Therapy - this provided the biggest boost (energy and focus) 2. Jack3d - steady energy increase throughout workouts (didn't have the kick-in-the-butt start that #1 had) 3. Controlled Labs White Flood - tingly 4. BSN NO-Xplode