Instruct: Classify the given review as either positive or negative.
Query: Ok for engery, worse attention.. 500mg is TOO high of a dose

First of all 500 mg is too high of dose, and they should not recommond 2(1000mg)...i took one, and felt a energy, headache, and could not fall a sleep... it does not seem to be helping much with attention...however it does gives you engergy if you are feeling like not getting up doing ur daily work....