Is it possible to use the same substances which are contained in an authorised medicinal product, also in foodstuffs intended for particular nutritional uses or in dietary supplements?

Annex 13 of Decree No 54/2004 Coll. defines a list of substances which may be added to foodstuffs intended for particular nutritional uses.  

Substances listed in Annex 13 apply only to foodstuffs intended for particular nutritional uses. These are vitamins, minerals, amino acids, and other substances which are present in regular foodstuffs, in fruit, vegetables, etc. Although they are contained also in medicinal products, it is not a reason for prohibiting their inclusion in foodstuffs intended for particular nutritional uses (furthermore, their amounts in medicinal products are usually larger).

Dietary supplements are a separate category of foodstuffs and are governed by Decree No 225/2008 Coll.; Requirements governing their composition are stipulated in the annexes to this Decree. Decree No54/2004 Coll. does not apply to dietary supplements.