Back in the 90s I wanted to get a store I worked in to carry it. I looked up the caffeine levels. Drinking two cans of regular cola at the time would have given you the same amount of caffeine as 1 can of Jolt ( back then ) or a cup of coffee. Looking at the resurrected jolt 16 oz gives you 200 milligrams of caffeine. Sixteen ounces of coffee ( two cups ) will give you about 182 milligrams of caffeine. The speed you imbibe caffeine with matters. People are going to take it in a lot more slowly drinking hot coffee. This new Jolt makes it easy to dump those 200mg into your system very quickly. That is even more true with non-carbonated energy drinks. Perhaps too quickly for your system to handle.