Energy isn't just from caffeine—and isn't just in drinks

What started in coffee, then famously started the billion-dollar energy drink category, is diversifying further. Supplements editor Todd Runestad strolls through—no, hustles—nay, runs at full tilt!!—through the Natural Products Expo East show floor in search of the many ways to energize your tired, flustered, worn-out customers. He visits Vital Proteins, Youtheory and Quality of Life.