A lot of stress at work and I was finding myself cornering what I was saying as I was talking. I ordered this product hoping to lift up the fog and did exactly that. Actually within about 15 minutes, I could already feel clearer in the morning (which is the one time a day I took it). I'm sure the caffeine helps in the morning. I didn't know there was caffeine in it. Wish it had been clearer - I'd have given it another star. The product does carry me thru the day, though. I won't take two though because sleep well is difficult.