I have not really felt any improvements as of yet. It might be due to caffeine version but just requested the non caffeinated unit back. It was making my chest pound after 20 -30 minutes of taking. I have not felt more focus, improved memory, no positive thinking and any will power. I have increased my dosage to 10 pills. I still find myself getting worried and not confident about the memory and focus side of things. There might be still time I need to take for body to adjust. So, I will con...Read more.