I bought three bottles of this, and then three more .. It seemed to just make everything work better. It seemed to improve my stride throughout the day, it felt like my brain was working better, and I was committed: I never missed a day. (Then the next shipment came in a berry flavor, and heavy on the maltic acid ((rather than citric)) and I had to stop. The berry doesn't sit well with me, so I can't use the product anymore. ) : -(