What is a pharmaceutical drug?
In pharmacology, a drug is "a chemical substance used in the treatment, cure, prevention, or diagnosis of disease or used to otherwise enhance physical or mental well-being." Pharmaceutical drugs may be used for a limited duration, or on a regular basis for chronic disorders. (Wikipedia)
What can you claim for a pharmaceutical drug?
By definition a drug is used to diagnose, treat or prevent disease. (Wikipedia)
What is a food supplement?
A food or dietary supplement is a product intended for ingestion that contains a "dietary ingredient" intended to add further nutritional value to (supplement) the diet. (FDA)
What can you claim for a food or dietary supplement?
Some dietary supplements may help to ensure that you get an adequate dietary intake of essential nutrients; others may help you reduce your risk of disease. (FDA)
This means you cannot claim for a food supplement to diagnose, cure, treat, or prevent disease, such as anemia.
You can, however, treat iron deficiency, which affects many millions of people. In fact, in many countries, it is a huge problem.