Are food supplements medicines? Food supplements are products containing concentrated sources of vitamins and minerals. Food supplements are regulated by the Food Standards Agency ... Like all foods it is not legally possible to make medicinal claims for food supplements as both food and medicines legislation prohibits this. To decide whether a product sold as a supplement is actually a medicine, the MHRA look at the ingredients of the product and how the product is presented to the public. In general terms, products which only contain vitamins and minerals are not normally regulated as medicinal products unless they are marketed to treat or prevent disease, or adverse medical conditions.