I have some serious issues remembering the simplest things. I started a new vitamin regimen and I have to take them at specific times. I can't tell you how many days I walked around with the little packet of vitamins in my purse because I kept forgetting to take them. Finally, I set the alarms on my iPhone to remember and voila! I've been through three packets of vitamins in three days.
Common sense I know, but it helped me out big time!