The main ingredient in energy drinks like Red Bull and RockStar that revs you up isn’t caffeine. In fact, an 8.5-ounce can has only about as much caffeine as a cup of coffee. The energy actually comes from taurine, a stimulant much more potent than caffeine.
Today taurine is synthesized in laboratories, but it was first discovered by German scientists in 1827, as a naturally occurring substance in the bile of oxen. Yum!
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