1. European Directive 2002/46/EC on the approximation the laws of the Member States relating to food supplements. Available at http://eurlex.europa.eu/legalcontent/EN/ALL/;ELX_SESSIONID=g52vJqTYtQjyNL8rycyNGLDhYqDkPqp8FrkBxyJsplfj3LckrrLs!1424345081?uri=CELEX:32002L0046
2. European Advisory Services (EAS) (2007). The use of substances with nutritional or physiological effect other than vitamins and minerals in food supplements. Study undertaken for DG SANCO, European Commission. Service contract nrSANCO/2006/E4/018. Available at: http://ec.europa.eu/food/food/labellingnutrition/supplements/documents/2007_A540169_study_other_substances.pdf.
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4. Palmer, M., Haller, C., McKinney, P., Klein-Schwartz, W., Tschirgi, A., Smolinske, S et al., Adverse events associated with dietary supplements: an observational study. Lancet, 361 (9352):101-106, 2003.
5. Timbo, B., Ross, M., McCarthy, P., Lin, C., Dietary supplements in a national survey: Prevalence of use and reports of adverse events. J Am Diet Assoc, 106:1966-1974, 2006.