That being said, I have tried the RTDs and concentrates and like its high antioxidant and Vitamin B/C content. Plus it's made mostly from fruit juice concentrates. As with anything else, know your caffeine tolerance and hydration levels. The "recommended intake" is 2-3 cans per day, however I've found myself slightly dehydrated drinking three in a day and "buzzed" after drinking two within a few hours of each other. Possibly more caffeine than listed, or possibly due to me having a low caffeine tolerance. FRS is just about the only source of caffeine I ingest. I haven't had a soda in more than two years, don't drink coffee and rarely have tea or an "energy drink" like Red Bull (maybe half a dozen times/year). I mainly stick with milk, water and fruit juices ... and the occasional beer, of course. 
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Доверяй, но проверяй (trust, but verify)
"A human being should be able to change a diaper, plan an invasion, butcher a hog, conn a ship, design a building, write a sonnet, balance accounts, build a wall, set a bone, comfort the dying, take orders, give orders, cooperate, act alone, solve equations, analyze a new problem, pitch manure, program a computer, cook a tasty meal, fight efficiently, die gallantly. Specialization is for insects." - Robert A. Heinlein, The Notebooks of Lazarus Long
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