Functional or "healthy" drinks claim to calm you down, boost your energy, or improve brain health. Celebrities from Katy Perry to Bella Hadid have embraced them. But are they actually worth it?
Brandon Bell/Getty Images
Stephen Brashear / Stringer / Getty Images
Harvest Hill Beverage Company; Molson Coors
Paige DiFiore
Rena Goldman
Bryan Bedder/Getty Images for Crystal Pepsi
Monster