1. FDA (1994) Dietary Supplement Health and Education Act of 1994 (United States Public Law 103–417; 103rd Cong., 25 October 1994). Food and Drug Administration, Department of Health and Human Services, Washington, DC
2. Hoffman FA (2001) Clin Obstet Gynecol 44:780–788
3. Commission on Dietary Supplement Labels (1997) Report of the Commission on Dietary Supplement Labels. US Government Printing Office, Washington, DC, p 17
4. Sarubin A (2000) The health professional’s guide to popular dietary supplements. The American Diatetic Association, Chicago, IL, p 3
5. Israelsen LD, Barrett M (2004) History and regulation of botanicals in the United States. In: Barrett M (ed) The handbook of clinically tested herbal remedies. Haworth, Binghamton, NY, pp 3–12