Everything consumed in an unhealthy amount can be harmful to your health. The same theory applies to the consumption of caffeine. No individual should exceed consuming 400mg of caffeine per day. Caffeine can have harmful effects on your health if you exceed the daily consumption limit. Some of the side effects include headaches, nausea, jitters, high blood pressure, difficulty in sleeping, and increased heart rate. Thus, it is recommended that you consult with a certified medical professional before consuming supplements with caffeine. If you have any heart conditions, high blood pressure, or are lactating or pregnant, it is crucial that you check with your doctor.