If you thought energy drinks were little more than sugar water, scientists from Mayo Clinic can assure you that they really do pack a punch.
A team of cardiovascular researchers at the esteemed clinic in Rochester, Minn., reported that a single can of Rockstar energy drink can boost your blood pressure and cause the fight-or-flight hormone norepinephrine to increase in just 30 minutes.
These discoveries were made with the help of 25 volunteers, each of whom who downed a 16-ounce can of Rockstar on an empty stomach in five minutes or less. A single can contained 240 milligrams of caffeine and 2,000 mg of taurine, along with guarana seed, ginseng root and milk thistle extracts.
Source: Researchers detail what a Rockstar energy drink does to your body – LA Times