Jon V. reviewed Qualia Focus
If you are looking for a totally natural way to enhance your focus and concentration, I highly recommend Focus from NeuroHacker. I has totally helped my performance at work.
Organized and focused
I thoroughly enjoyed my first bottle of Qualia Focus. I use it when I feel like I need an extra boost for focusing on specific tasks or completing small projects. It lasts for most of the day for me since I don't consume caffeine daily.