 Buying medications from anywhere that's not a licensed brick-and-mortar pharmacy means you do not know exactly what you're buying, according to Shabir Ember Safter, the executive director of the Partnership for Safe Medicines. He says e-commerce sites like Amazon or med spas purchase the drugs from third-party sellers, which means it could contain harmful substances, incorrect dosages, or even inactive ingredients. But we've actually seen counterfeit, perfect look-alike counterfeits over the past few years in HIV, in blood thinners, in oncology. There's no therapeutic area which is safe from counterfeit medications.