1. National Cancer Institute. Definition of drug [Internet]. Bethesda, MD: National Cancer Institute; 2011 [cited date 2023 April 21]. Available from: https://www.cancer.gov/publications/dictionaries/cancer-terms/def/drug.
2. Marino M, Jamal Z, Zito PM. Pharmacodynamics. In: StatPearls [Internet]. Treasure Island, FL: StatPearls Publishing; 2023 [cited date 2023 December 25]. Available from: http://www.ncbi.nlm.nih.gov/books/NBK507791/.
3. Nasri H, Baradaran A, Shirzad H, Rafieian-Kopaei M. New concepts in nutraceuticals as alternative for pharmaceuticals. Int J Prev Med. 2014; 5: 1487-1499.
4. Dias DA, Urban S, Roessner U. A historical overview of natural products in drug discovery. Metabolites. 2012; 2: 303-336.
5. Federal Ministry Federal Office. Medicinal Products Act (Arzneimittelgesetz – AMG) [Internet]. Berlin: Bundesministerium der Justiz; [cited date 2023 April 22]. Available from: https://www.gesetze-im-internet.de/englisch_amg/englisch_amg.html.