ABB Speed Shots, other energy drinks...

I've tried the ABB speed shots, the VPX Redline drinks and other energy drinks to give me a little boost prior to training, but I think I'm just immune to them from drinking so much coffee throughout the day. Are there any other drinks out that might work? The speed shot will give me a little jolt, but it isn't sustained for very long. I have to drink the whole thing (which is actually 2 servings) to achieve this effect.

I'm thinking about just going back to ECA stacks, but I can't remember if I got really jittery from them or not

I would think you will be fine on eca if you get nothing from speed shot

That's kind of what I was thinking, but I just couldn't remember how I reacted to them in the past. I just got a lot of ephedrine tabs so I'm ready to rock and roll