I know this pisses people off to hear, but meth is an acceptable substitute if you stick to oral doses. Speed is kind of always 20-50% caffeine unless you order from one of the big names (CapeCrusader, Maxhavelaar, BoyMaster, and iisthisisi currently I think), and doesn't always do the job. Meth on the other hand generally always *almost* does the job. If you don't mind the stigma, it's worth a small order to test if it works well for you or not.(meth is marketed legally as the pharmaceutical desoxyn)