"It gave me a good solid three or four hours of alertness and clarity"

I don't know about you, but after I've had lunch, especially a big lunch, it's not always so easy to get back to the level I was in the morning. So recently I just tried Focus to replace the coffee I would usually have, and I'm quite happy with the results, I have to say. 

It gave me a good solid three or four hours of alertness and clarity,  kept me on my task, and overall it basically delivered the effect that was promised.