If you mean how they should be labelled, here is explanation.Nutritional supplements are required to be clearly labelled with the word "supplement."The label must also show the volume or weight of the contents, the serving size, a list of dietary ingredients and non-dietary ingredients (e.g., artificial colour, binders, fillers, flavourings), the name of the manufacturer, packer, or distributor, and directions for use.If the supplement is an herb, the label must contain its scientific name.