My experience with l-tyrosine.. this stuff rocks!
Just thought I'd bring it up in case others don't know about this stuff... you can get a ton of it for 10 bucks at any vitamin store and it KICKS ASS! I take a gram of it at a time, and it works as well as the first time I used ephedrine and caffeine. I also feel much more alert, which is a huge bonus. My ability to concentrate and focus is much, much better than with any other stimulant.
Pick some up and try it! Tomorrow I will give it a shot with 200mg of caffeine as well and see how that goes.
This might really help me with my depence on pre-workout E/C..