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I was told to try just taking one first time cos two would have me clinging from the ceiling. I'm a nut and took two - I trained for two and a half hours in a super focused, alert but dreamy state. Not cos I like training for two and a half hours, just cos I felt so wired and good I couldn't stop!
They don't give me the unpleasantness of, say, too much caffeine. Very effective, felt good, trained GREAT when using. IronMike