Natural Products Foundation
The Natural Products Foundation is a non-profit organization whose mission is to promote and facilitate research and education regarding natural products, including dietary supplements and nutritional foods. The NPF encourages those who advertise natural products to join their Truth in Advertising Pledge, which aims to ensure ads for natural products are truthful and not misleading. Companies that have taken the pledge get to stick an NPF logo on their ads. Of course, pledging is purely voluntary and revocation of the right to use the NPF logo appears to be the only sanction for breaking the pledge.