I've been enjoying this: Amazon Link: SmarterVitamins 200mg with L-Theanine & MCT Oil

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The pills taste sweet thanks to the MCT, so the swallowing part isn't nasty and they give me plenty of energy. I am a caffeine monster, though - I take probably (definitely) way more than I should, ranging from 3 - 4 a day. For reference, the Mayo clinic recommends 400mg / day (2 pills).