REVIV, a medical spa at the MGM Grand, is changing the way spas offer hydration treatments, this article says. It provides hydration therapies through an IV infusion with doctors, paramedics and nurses standing by. Not all spas in Vegas take to needles, though. The Spa at Bellagio has a facial for hair and mint pedicure, and THEhotel at Mandalay Bay offers a jade detox.

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