I'm not sure how safe they are, but considering that I--a bona fide caffeine addict--can tell the difference in my alertness when I switch from my typical vodka/cran or vodka/Diet Cokes to vodka/Rock Star, I knew that the caffeine has to be significant. However, I had no idea that serving for serving, Rock Star has more than three times the caffeine as Diet Coke. I can't really drink more than one glass of the stuff without getting tremendous heartburn (sucks to get old), but if folks are drinking four or more servings of the stuff, they're ingesting a crazy amount of additives. Eeek, no wonder folks are experiencing side effects! Be safe out there, chicas!
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