Only products that have received a market authorization or product licence from Health Canada are approved for sale in Canada. Authorized products will bear a Drug Identification Number (DIN) or a Natural Product Number (NPN) or a Drug Identification Number for Homeopathic Medicine (DIN-HM). These numbers serve as a means for the public and health care professionals to know that the product is authorized to be sold on the Canadian market.
NAPRA's National Drug Schedules (NDS) contain products with a DIN. NAPRA's Policy for Natural Health Products explains the history of natural health products as they related to the NDS and clarifies the applicability of the NDS to products with the classification of NPNs or DIN-HM.
In short, products with an NPN or DIN-HM are deemed beyond the scope of NAPRA's NDS. However, as the relationship of natural health products to the NDS has evolved over the last decade, some older natural health products are currently listing in the NDS and these continue to be maintained in the drug schedules for now.