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1 of 1 people found the following review helpfulMarch 21, 2011Reviewer: Paul in Massachusetts* Being a little older, I don't have the energy to get through a hard workout without needing a little boost. I was looking for something that would sustain my energy for a few hours. This one doesn't work for me. I tried the regular dose for the first day, hardly any difference, day 2 and 3 increased to the max dose. It did help some but no more than a cup of coffee, I can get one of those a lot cheaper.