A Practice Note providing an overview of the Food and Drug Administration (FDA) labeling requirements for dietary supplements. This Note discusses the basic labeling elements, such as the statement of identity, the net quantity of contents, and nutrition labeling, nutrient content and health claims, statements of nutritional support ("structure/function" claims), and labeling triggered by the presence of particular ingredients, claims, or other factors. It also covers allergen and gluten-free labeling as well as certain label claims and statements regulated by the US Department of Agriculture (USDA) and US Customs and Border Protection (CBP).