i was looking for healthy drinks when i saw this. got it because of the good reviews but really there should be regulations on these type of products. This is more than 2x caffeine of coffee. i drink 1/2 can that day and could not get any sleep that night or next day. read a book to help me sleep but keep waking me up in a “fear like”fashion, fear of falling or nightmare-ish. basically i was very tired and each tme i was falling asleep it wakes me. i am an occassional coffee drinker and green tea drinker so im not new to caffeine. These things should be sold as drugs not healthy enegy drinks. But hey!! 1 star for it, it does taste good. its perfect if you are a drug addict.