Soon after I checked into the Equinox Hotel in Manhattan, a nurse arrived in my room to administer an intravenous vitamin infusion.

“It’s our signature drip, it’s got a little bit of everything in it,” nurse Courtney explained cheerfully, as she prepared a cocktail that included vitamin C, magnesium and a jumble of other life-boosting ingredients. As I watched the orange-yellow contents of an IV bag drain into my arm, I accepted Courtney’s assurances that my hair and skin would gain a noticeable shine.

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