 Independent research published by the National Bureau of Economic Research demonstrates that online pharmacies, U.S. and foreign, verified by certain credentialing entities, sell genuine medication and require a prescription.In that study, all tested prescription drug orders were found to be authentic when ordered from online pharmacies approved by pharmacychecker.com (both international and U.S.-only); U.S. online pharmacies approved by the NABP, Verified Internet Pharmacy Practice Sites (VIPPS) program, or LegitScript; and Canadian-based online pharmacies approved by the Canadian International Pharmacy Association.Nine percent of tested products ordered from uncredentialed online pharmacies were counterfeit.