After using it for a couple of weeks now I figure that I'd comment after some prolonged use. It definitely gives you a pick-me-up, and has enhanced my performance both intensity and duration wise, when compared to not taking it under the same conditions (amount of sleep the night before/exercise type). I wouldn't say that its all from the caffeine it contains because thats just one small ingredient of many different vitamins and minerals. I switched to this over redbull because redbull is more caffeine than anything else, which is what gives you the "boost". Here is their website. http://www.powerblastenergy.com/.

They are available for purchase either on their website, which is kinda expensive, and at Costco Wholesale Stores, where I got a box of 24 for $20.00, a WHOLE lot cheaper than Redbull, which I get in bulk 12 for $20.00.

MiKe