Chris, correct me if you know otherwise, but I have read that caffeine will significantly decrease the effect of Tyrosine, possibly completely inhibit. I used to add caffeine to my Power Drive as well, but since have switched to adding Bacopa, Vinpocetine & Huperzine. By the way for all of you who feel like you need to check into a methadone clinic to cut down on caffiene, try the above combo, it will give a great buzz that appears to be far healthier than caffiene, and PubMed researsh shows that some of the ingredients will even work better over time (Bacopa in particular). Vinpocetine also works better sublingualy I have found, try about 10-20mg. What do you think Chris?
WHOOPS!
The first sentence of my previous post should have read, "I do NOT think you are stupid or slick. . .’
Sorry!