On April 2, the FTC announced that it joined the Food and Drug Administration (FDA) in sending letters to three supplement companies warning them that making allegedly unsupported health and efficacy claims in their advertising may violate the FTC Act. According to the letters (available here, here, and here), the three companies advertise supplements they say contain cannabidiol (commonly known as CBD), and, allegedly, among other things, effectively treat diseases such as cancer, Alzheimer’s disease, fibromyalgia, and neuropsychiatric disorders. The letters emphasize that it is unlawful under the FTC Act “to advertise that a product can prevent, treat, or cure human disease unless you possess competent and reliable scientific evidence, including, when appropriate, well-controlled human clinical studies, substantiating that the claims are true at the time they are made.” The letters also note that the products constitute “new drugs” and cannot be introduced or delivered into interstate commerce without prior FDA approval. The letters appear related to the FTC’s initiative to target advertisers who make deceptive claims about their products. As previously covered by InfoBytes, FTC Chairman, Joseph Simons, spoke about this initiative at a recent conference, and cited several of the agency’s enforcement actions, including challenges to dietary supplement health benefit claims and deceptive environmental claims. Additionally, he stated the agency is prepared to “proceed in federal court as warranted.”