for years I could not focas,always tired.my dr said you have adhd.I was thinging i am to old for this.thinging back to school,always had a hard time i heard only what i wanted to .after taking this I felt like a new person had mory engery,think clearer.no longer need naps.I get alot more done I can even finsh a book.the only con is if you dont take it you fell tired and no enery.they came out with a gen so for 3 months its only 7.50 ask your dr for 3 month  it changed my life