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Jellin JM, editor. Pharmacist's Letter/Prescriber's Letter Natural Medicines Comprehensive Database Web site. Available at: http://naturaldatabase.com/. Accessed January 25, 2008.
National Institutes of Health. Office of Dietary Supplements. Dietary supplement fact sheet: folate (8/22/2005). NIH Web site. Available at: http://ods.od.nih.gov/factsheets/folate.asp. Accessed January 25, 2008.