1. Enough is enough: stop wasting money on vitamin and mineral supplements;Guallar;Ann Intern Med,2013
2. Supplement business report 2011;Nutrition Business Journal,2011
3. Dietary supplement use in the United States, 2003–2006;Bailey;J Nutr,2011
4. Why do Americans use dietary supplements? Motivations for dietary supplement use;Dwyer,2005
5. Dietary Supplement Health and Education Act of 1994 [21 USC§ 401(q)(5)].