and spinal cord—to make you feel more awake and alert. Are Caffeine Pills Safe? Caffeine pills can contain natural or synthetic caffeine. Some products may contain inactive ingredients such as ...

Increased use of caffeine, theophylline ... Experts say these pills allow users to stay awake for 40 hours or more at a ...

Another small study on sleep-deprived women who spent 10 to 20 minutes walking up and down the stairs had more energy than ...