Study says it might be the ritual of taking placebos that makes them work like pills. David Sucsy/iStockphoto.com hide caption

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The maker of the Man Up Now sexual supplement says it contains fruit like these from the Wolfberry plant to prevent side effects from other ingredients. Wikimedia Commons hide caption

itoggle caption Wikimedia Commons

Shane Wendel, a pharmacist and owner of the Central Pharmacy in New Rockford, N.D., speaks to customer Marvel Ebenhahn about her prescription. "I get to choose how I direct patient care, and what I spend my time on to help my patients," Wendel tells Shots. Dale Wetzel/AP hide caption

itoggle caption Dale Wetzel/AP

Billy Tauzin, former congressman and CEO of the Pharmaceutical Research and Manufacturers of America, in a 2008 file photo. Mike Wintroath/AP hide caption

itoggle caption Mike Wintroath/AP

There's a lot going on with the little blue pill called Truvada made by Gilead Sciences of Forest City, Calif. Paul Sakuma/AP hide caption

itoggle caption Paul Sakuma/AP