I can't believe no one has mentioned K-Otic! I liked PumpFix for the fizzing and descent energy, never tried Jack3d, Muscle Marinade is good but the flavors get old (though they did just come out with Cherry Limeade) but it has Geranium in it and I just don't like the way it made me feel after a while. K-Otic has ben treating me really good with great focus, energy, BA tingles that everyone loves, no crash and best of all 3 new and revamped flavors!
PM me if you'd like some samples before you buy anything!
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