Researchers at Villanova University report that anywhere below 200mg and 300mg of caffeine per day is the proper amount. It is important to know that there is a great amount of nuance to this topic. Depending are particular characteristics, caffeine can negatively impact one's health. Too much caffeine can result in symptoms of insomnia, restlessness, stomach discomfort and more. It is also important to consider how caffeine is consumed. It comes in many different forms, coffee, energy drinks, pills, and more. Some substances labeled as "caffeinated" also include harmful additives that can result in negative health consequences.