1. Retail vs. direct channels analysis: supplementa and total nutrition industry sales: 1997-2008-Chart 129 Nutrition Business Journal 2008
2. Herbal supplement sales experience slight increase in 2008;Cavaliere;HerbalGram,2009
3. Food and Drug Administration Dietary Supplement Health and Education Act of 1994 http://www.fda.gov/RegulatoryInformation/Legislation/FederalFoodDrug andCosmeticActFDCAct/SignificantAmendmentstotheFDCAct/ucm148003.htm 2009